Responsible innovation, anticipation and responsiveness: case studies of algorithms in decision support in justice and security, and an exploration of potential, unintended, undesirable, higher-order effects

The collection and use of personal data on citizens in the design and deployment of algorithms in the domain of justice and security is a sensitive topic. Values like fairness, autonomy, privacy, accuracy, transparency and property are at stake. Negative examples of algorithms that propagate or exacerbate biases, inequalities or injustices have received ample attention, both in academia and in popular media. To supplement this view, we will discuss two positive examples of Responsible Innovation (RI): the design and deployment of algorithms in decision support, with good intentions and careful approaches. We then explore potential, unintended, undesirable, higher-order effects of algorithms—effects that may occur despite good intentions and careful approaches. We do that by engaging with anticipation and responsiveness, two key dimensions of Responsible Innovation. We close the paper with proposing a framework and a series of tentative recommendations to promote anticipation and responsiveness in the design and deployment of algorithms in decision support in the domain of justice and security.


Introduction
In this paper we are concerned with the utilization of algorithms in the domain of justice and security. The usage of algorithms is associated with promises to increase efficiency and effectiveness of, e.g., law enforcement or the judiciary process. Using algorithms can, however, also cause significant harms, e.g., in terms of bias, unfairness and discrimination [9,12,13,32], and can fall short regarding transparency and accountability [5]. Our aim is to explore both positive and negative views on algorithms more specifically, we will explore potential, unintended, undesirable, higher-order effects of algorithms-effects that may occur despite good intentions and careful approaches.
We will focus on algorithms that are used for decision support. For example, a police officer may use an algorithm for risk assessment while engaging with citizens. This algorithm may show red flags behind a specific citizens' names. Officers will typically interpret such flags as advices and interpret them based on their professional perception, understanding and judgement of the situation at hand. This is their professional, discretionary competence.
We can contrast this usage of algorithms as tools for decision support, with the usage of algorithms as agents, 1 e.g., in systems that autonomously make decisions without human intervention. This contrast, however, is not a sharp one and rather describes a continuum. Imagine that police officers always follow the algorithm's advice. They never neglect or overrule the algorithm's advice. Do these police officers then act like agents? Or more like a cogs in a machine? Or, conversely, imagine that police officers never follow the algorithm's advice. They always neglect or overrule it. What is then the algorithm's function or added value? In reality, many police officers will do something in-between: they will use their professional, discretionary competence and sometimes follow the algorithm's advice, and sometimes neglect or overrule it. We understand the agency of police officers in the context of a sociotechnical system [25], in which their agency is connected to other persons, e.g., to supervisors or peers, or to reports in the police organization, and to various machines and processes to which they delegate some tasks and parts of their agency.
The design and deployment of algorithms in the domain of justice and security raises a range of ethical questions [29], values like fairness, autonomy, privacy, accuracy, transparency and property are at stake [20]. We can further extend this list with values from, e.g., the tradition of Value Sensitive Design [17] 2 or the European Commission's High-Level Expert Group on Artificial Intelligence [21]. 3 Hayes et al. [20] argue that some values have intrinsic value, e.g., fairness, autonomy and privacy, and that other values have instrumental value. The latter function as means to support other values, e.g., accuracy and transparency are typically instrumentally needed to support fairness. Or the other way around: a lack of accuracy or of transparency can negatively impact fairness. Another example is autonomy: police officers' autonomy is dependent on the accuracy of the data that go into algorithm ('garbage in, garbage out') and on the transparency of the algorithm. Can they trust the system and explain what they do, e.g., to citizens they are engaging with? In more general terms, the human decisionmaker's autonomy depends on the system's accuracy and transparency.
These relationships between values complicate matters considerably. Some values may be needed to support other values, like accuracy and transparency are needed to support fairness and autonomy. Or values can conflict: for example, ownership and property rights of parties that develop or sell algorithms can come into conflict with other parties' values regarding transparency. Another example is the potential conflict between citizens' privacy and accuracy, since the accuracy of machine learning algorithms is typically related to having a lot of data points on a lot of people, to 'train' the algorithm.
This knowledge, about values and interdependencies and conflicts between values, can support people in the design and deployment of algorithms. They can identify and discuss values that are at stake in their project. It remains challenging, however, to identify which specific values are relevant in a specific case, and to find appropriate balances between conflicting values. One way to deal with is to resort to general principles. One can, e.g., follow the principles that the European Commission's High-Level Expert Group on Artificial Intelligence [21] put forward: respect for human autonomy, prevention of harm, fairness, and explicability. They will, however, typically need to do some heavy lifting to 'translate principles into practices' [30]. Merely being aware of ethical principles will not bring about beneficial algorithms [28]. Or worse, just signalling of ethical principles can be unethical [15].

A twofold view and methodology
It occurred to us that negative examples typically receive ample attention, both in academia and in popular media. Think of the books and articles about algorithms that propagate or exacerbate biases, inequalities or injustices, e.g., in predictive policing or in the judicial process. This work is very valuable indeed for many reasons. In a relatively young and dynamic field like data science, which deals with emerging and consequential technologies, critical studies are direly needed. On the other hand, we believe that it can also be instructive to share positive examples; examples of 'Responsible AI' [11]. We can learn from projects in which people worked with good intentions and with careful processes. We therefore follow a twofold methodology in this article. We first focus on positive or responsible examples. We discuss the principles put forward by the High-Level Expert Group (2019) and provide some context for the design and deployment of algorithms in government (in The Netherlands; where the authors reside). We then discuss two positive examples (from the Netherlands; for pragmatic reasons), to discuss the application of these principles in design and deployment 'on the ground'. After that, we shift gears and adopt a more critical view. We engage with anticipation and responsiveness, two key dimensions of Responsible Innovation [40], and explore several potential, unintended, undesirable, higher-order effects of algorithms. We believe that, even if it might not always be possible to prevent such negative effects from happening, it is at least useful to anticipate such effects, to be responsive, and attempt to mitigate their impacts, as much as possible. We close the paper with suggestions to further promote this type of anticipation and responsiveness.

3 3 Algorithms and ethical principles: a European perspective
In April 2018, the European Commission stated its aspiration to ensure that Artificial Intelligence (AI) applications are based on values and benefit individuals and society. 4 One year later, in April 2019, the European Commission's High-Level Expert Group on Artificial Intelligence [21] put forward Ethics Guidelines for Trustworthy AI, with four 'ethical principles' for the design and deployment of 'lawful, ethical and robust' AI systems (pp. [11][12][13]: respect for human autonomy; prevention of harm; fairness; and explicability. 5 Below, we relay their descriptions and discussions of these principles (pp. 12-13; in italics), and add several comments for our discussion of algorithms in decision support.  [38], who recently conceptualized agency as an interplay between computer automation and human control. He advocated viewing computer automation and human control not as opposites on one axis, but as two perpendicular axes, and combining high computer automation and high human control to make AI 'reliable, safe and trustworthy'. This conceptualization with two axes can help to go beyond 'algorithm as tool'

Respect for human autonomy
versus 'algorithm as agent' dichotomy and explore ways to use algorithms under human control. enables member states' citizens to challenge the utilization of algorithms, to demand inspection of their personal data, and, if necessary, to seek correction and redress.

Explicability
'Explicability is crucial for building and maintaining users' trust in AI systems. This means that processes need to be transparent, the capabilities and purpose of AI systems openly communicated, and decisions-to the extent possible-explainable to those directly and indirectly affected.
[…] The degree to which explicability is needed is highly dependent on the context and the severity of the consequences if that output is erroneous or otherwise inaccurate.' Crucially, this description refers not only to the explicability of the algorithm itself, but also to processes in which algorithms are used, the capabilities and purposes of systems in which algorithms are used, and to communication about these processes, capabilities and purposes. We saw this broader perspective also under procedural fairness. Furthermore, it is critical to recognize that algorithms can vary regarding their inner workings and in their associated explicability. One can imagine a spectrum, with on the one end a simple decision tree ('if x, then y'), with a handful of branches with clear and stable cut-off values, so that its inner working is transparent and easy to understand or explain, and on the other end a complex neural network ('deep learning') with thousands of variables that interact with each other dynamically, so that its inner working is opaque and hard to understand or explain. The High-Level Expert Group also discuss tensions between these principles, e.g., between prevention of harm and respect for human autonomy. They mention 'predictive policing' and argue that it may help to reduce crime, and also that it may bring risks related to individual liberties and privacy (2019, p 13). This means that different values need to be carefully considered and balanced.

Algorithms for decision support in government
Before we move to the case studies, we need to provide some context for the design and deployment of algorithms in decision support by the government in The Netherlands. Over the last 3 years (2018-2020) The Netherlands ranked 4th in the yearly European Digital Economy and Society Index (DESI), 6 which can be seen as an indicator of digital maturity. A recent strategy for digital innovation in the Dutch public sector advocates protecting fundamental rights, increasing accessibility and making personalized services, 7 and the Dutch government presented a strategic action plan for the application of AI. 8 Interestingly, the actual usage of algorithms for decision support in the Dutch government is currently rather limited; most instances are in experimental phases, rather than in implementation phases [44].
In the domain of justice and security, as in other sensitive domains, such as healthcare and education, the government approaches the design and deployment of AI with utmost care. This, however, brings them in a catch-22 position. Socio-technical trends lead to expectations that government agencies use state-of-the-art technologies; at the same time, these agencies are bound by legal and moral boundaries for using novel technologies. There have been a series of incidents in The Netherlands, in which political and societal forces pushed back on the application of algorithms, insisting on the protection of fundamental rights. One case received international attention: the court decision, in February 2020, to forbid usage of the SyRI algorithm, which the Ministry of Health, Welfare and Sport used to detect citizens' welfare fraud. 9 Such pushback motivated the Dutch government to produce a Toolbox for Ethically Responsible Innovation, 10 to help navigate between innovation and experimentation, and protecting public values and fundamental rights, like human dignity, human autonomy, fairness and privacy. 11 Moreover, a series of case studies of legal aspects algorithms in decision making was recently published [24].

A. Fine collection by phone to prevent debts, by the Central Judicial Collection Agency B. Risk Assessment of 'violent behaviour', by the National Police
Our case studies are based on interviews with the people involved in these initiatives, and on analyses of both internal documents and publicly available documents. Below, we first discuss the algorithm's goals and the current situation. We follow the High-Level Expert Group's four principles: respect for human autonomy; prevention of harm; fairness; and explicability (2019). With regards to human autonomy we focus on the role of civil servants who use algorithms, rather than on citizens as implicated actors ('data subjects') [20]. The perspectives and experiences of citizens are paramount in our discussions of preventing harm and of fairness. Our discussions of explicability deal with perspectives of both civil servants and citizens; both are involved in understanding and explaining the algorithm at hand.
Please note that we will not discuss privacy and data protection. These issues are, of course, at play. We chose, however, not to discuss these because of two reasons: these issues would take us deep into legal territory, away from ethical issues; and, in these cases, the people involved do take care of privacy and data protection; they are well aware of relevant legislation and comply to it.

Case A: fine collection by phone to prevent debts
The Central Judicial Collection Agency (CJIB; part of the Dutch Ministry of Justice and Security) is responsible for collecting a range of different fines, such as traffic fines and punitive orders. The CJIB aims to collect fines responsibly; to balance doing justice to vulnerable citizens and following the rule of law. Our case study focuses on one initiative: to approach selected people by phone to remind, motivate or enable them to pay their fines and thus prevent them from falling (further) into debt. Suppose, e.g., that one receives a speeding ticket of €100 and fails to pay. 14 The CJIB is then legally required to send an exhortation of €150. If one again fails to pay, another exhortation is sent, of €300. If one still does not pay, the CJIB can send a bailiff, the costs of which will also need to be paid. A fine of €100 can thus multiply to hundreds of euros. Still failing to pay the fine may result in coercive measures, such as seizure of one's car or, in extreme cases, imprisonment for (a maximum of) seven days.
For this initiative, the CJIB developed an algorithm that uses data from only the CJIB (the current fine, other open fines, and payment history; no data from criminal law or administrative law are used) to produce a list of people who would probably be willing to pay and can be incentivized, by providing them a reminder or a payment provision. 15 The fact that they use only their own data is noteworthy and commendable; it sets them apart from notorious cases of using data from multiple sources (e.g., [32]. Agents of the CJIB interpret the algorithm's output and decide whom to call from this list they make phone calls to individuals to discuss the situation and offer provisions, if needed. 16 Preventing these people from falling (further) into debts is beneficial to them, to their family members and friends, and to society at large.

Respect for human autonomy
With regard to respect for human autonomy, we will focus on the autonomy of the people who make the phone calls to these citizens. As noted (above), we do not focus on the autonomy of the citizens who are at the receiving end of this initiative. However, this initiative's aim is to support citizens in maintaining a certain level of financial autonomy. In that sense, respect for citizens' autonomy drives this initiative.

3
The agents who make these calls received a training program, 17 which emphasized that the call should not only focus on debt collection, but also make room for offering help in debt relief. At the moment, these agents' autonomy is not strongly affected by the system because they have professional competence to follow or not follow the list with names of people to call. In addition, the agents can ignore the algorithm's outcomes and they can add information to specific cases, e.g., specific situation about cases' context. In other words, the algorithm combines computer automation and human control [38].

Prevention of harm
The system's main goal is to identify and approach citizens who are at risk from going into (further) debts and offer them reminders or payment provisions. The algorithm will, however, produce not only true positives (people to approach), true negatives (people not to approach), but also false positives and false negatives. False positives refer to calling people and then finding out that they will not pay, which can be seen as a waste of the agents' time; a sort-of harm to the CJIB and its purposes, because time wasted in one place cannot be put to good use elsewhere. Furthermore, false negatives refer to people not being called, and therefore missing out on reminders or payment measures, which are actually in need of. They miss out on a service that was intended to benefit them. At the moment, the CJIB tends to find false negatives more problematic than false positives; their aim is to approach and support people in paying their fines and to 'better safe than sorry' (to accept false positives).
Both types of errors are hard to prevent from happening. What an organization can do, to reduce errors over the course of time, is create feedback loops that enables the people who use the algorithm's output and make the phone calls to report errors to the people who develop and control the algorithm, so that they can make corrections or modifications. The CJIB has created such feedback loops, including efforts to examine and understand negatives; to find out whether these are true negatives or false negatives.

Fairness
The algorithm does not lead to a differences in legal treatment of citizens; it is legally fair. Delving one spade deeper, however, we can discuss the fairness of treating different people differently. The algorithm points at people who may need incentives or support to pay their fines. At the moment, this service is perceived as additional, not as essential. It remains to be seen, however, how people, over the course of time, will perceive this; how will they perceive false negative errors (maybe as missing out on an essential service?) and false positive errors (maybe as a nuisance and a waste of time?).
Another dimension of fairness refers to procedural fairness. Are people at the receiving end of this process able to contest and seek effective redress? At the moment, the CJIB has various processes in place, via which people can express disagreement or complain about the process. 18 They are currently looking into ways to enable citizens to make legal objections. They want to have that in place before implementation.

Explicability
To promote the algorithm's explicability, i.e. its understandability and explainability, for audiences both inside and outside the organization, the CJIB put several measures in place. First, a general description of their initiative is publicly available, online. 19 In addition, the CJIB chose to use a relatively simple classification model 20 instead of, e.g., a relatively complex algorithm, such as random forest, which combines multiple regression analyses. 21 The former is like a decision tree, with stable and transparent cut-off points (e.g., 'if total amount of fines is higher than x, then offer measure y'); in contrast, the latter, more complex types of algorithms, can change over time and is therefore less transparent.
Those more complex algorithms can fall short regarding explicability; it can be hard for programmers to inspect and modify them, and it can be hard for agents to understand and explain them. On the other hand, these more complex algorithms can perform better than the simpler ones. Looking ahead, the CJIB are exploring ways to improve the algorithm's outcomes, e.g., using specific, trustworthy data sources outside the CJIB, 22 or by a using a random forest algorithm that is evaluated and updated every six months.
They want to combine maintain or even improve explicability and improve performance-and, of course, keep working in compliance to legislation.

Case B: risk assessment of violent behaviour
Since a number of years, the Dutch Police has embraced a data-driven approach [7]. Their ambition is to utilize data they already have collected during police work, notably the data in their incident registration system (but not to collect more data on citizens), following principles of legality and proportionality. We will focus on one initiative: the development of an algorithm that assesses the likelihood of violent behaviour of specific people. 23 Such assessments can help police officers to work more effectively and efficiently; e.g., approach potentially violent people carefully and appropriately. For the design and deployment of this algorithm, they use not only structured data in their system, e.g., a code for a specific type of incident, but also unstructured data, e.g., notes made by police officers; these typically contain more specific and detailed information.
The algorithm was developed mainly using experts' knowledge. Domain experts generated a series of terms that relate to violent behaviour, e.g., confused, crisis, psychotic and alcohol. They chose not to use machine learning to populate or expand this list of terms. They used these terms to build an algorithm that analyses police reports associated to a specific person (using data that cover a period 5 years), and produces a 'score' to represent the likelihood of this person expressing violent behaviour. They then invited another group of domain experts to test and evaluate the algorithm. This enabled them to modify and fine-tune the algorithm, e.g., assign different weights to different terms.

Respect for human autonomy
The police envision two use cases for this algorithm: in 'slow' or 'cold' processes, e.g., to study violent behaviour as a phenomenon and to generate information for briefing meetings at the police station; or in 'fast' or 'warm' processes, e.g., while police officers are dealing with an incident, 'on the ground'. For now, they envision using the system in 'slow' or 'cold' processes. For the future, however, they envision using it also in 'fast' or 'warm' processes. For example: there is a report of an incident and police officers hurry to the incident; meanwhile, their colleagues at the Real-Time Intelligence Centre (RTIC) use various sources, not only the algorithm's output, to assess risks and provide advice to the police officers. This way, there is a 'human in the loop': people at the RTIC use their professional discretionary competence to interpret the algorithm's output. The goal of the RTIC is to have sufficient, relevant and reliable information available to handle the situation at hand-not to automize decision making.
This 'human in the loop' approach is motivated by a respect for human autonomy of RTIC operators and of police officers on the street. Both can use their professional discretionary competences and combine the algorithm's output, relevant protocols and their own, professional judgement and discretion. This way of deploying the algorithm combines computer automation and human control [38].

Prevention of harm
Overall, the system is meant to prevent harm: to identify people who may behave violently, so that police officers can approach them appropriately and prevent that person from causing harm to other people or to themselves. There are protocols for police officers to prevent risks of bias, stigmatization or discrimination in their engagements with citizens, and the police are continuously working on these issues. Moreover, one may argue that not utilizing data that the police already have can cause more harm. Not utilizing these data may lead to police officers approaching people unaware of their potential to behave violently, which may cause more harm.
In addition, the division of labour between people at the RTIC and police officers on the street can help to prevent or mitigate risks for misusing or overusing the system. The people at the RTIC dedicate their energies at interpreting various sources of data, including the algorithm's output; they are enabled to reflect on their usage of the system, which prevents them from misusing or overusing it. At the same time, the police officers on the street can focus on the situation at hand and the people they interact with; they do not need to bother with the algorithm and there is little risk that they misuse or overuse the system.

Fairness
The developers chose to follow a cross-industry standard process for data mining (CRISP-DM), to work systematically and carefully. This entails organizing an iterative process for modelling, development, deployment and evaluation, and processes to better understand both the business in which the algorithm is deployed and the data that are used. This process enables the people involved to create feedback loops that can help to identify incorrect or unfair outcomes of the algorithm and to mitigate these.
At the moment, the system is in an experimental phase; it is not yet operational. Questions regarding procedural fairness are therefore currently open. Such questions relate, e.g., to citizens' abilities to question, contest and seek redress against decisions that are based on a combination of the outcomes of the algorithm and the interpretations of the people who use the algorithm.

Explicability
The choice to start the development of the algorithm with knowledge of domain experts yields promotes the system's explicability. These experts produced a list of terms, that others can inspect and modify if necessary. Furthermore, the algorithm is transparent in the sense that it uses an explicit and limited list of terms and weights, which can be inspected. Alternatively, they could have chosen to use, e.g., a deep learning algorithm that is fed with labelled data so that it can 'learn'. These algorithms are notoriously less transparent; it is often and typically hard to inspect variables and weights in these algorithms, which makes them hard to understand and explain, and hard to correct or modify.
In the current set-up, police officers on the street do not need to understand or explain the algorithm to, e.g., citizens whom they are engaging with. They receive information from the RTIC and combine that with their professional perception and judgement.

Summary and limitations
These two cases by and large follow the ethical principles that the High-Level Expert Group on AI (2019) put forward: respect for human autonomy; prevention of harm; fairness; and explicability.
The CJIB agents who make the phone calls (Case A), and the RTIC operators and the police officers (Case B) are required to use their professional discretion, which respects human autonomy. Both cases have as primary aim to prevent harm: to prevent people from falling (further) into debt (Case A) and to approach citizens with appropriate care (Case B). Both cases aim to uphold and promote fairness; we discussed various measures to maintain substantive fairness. It is, however, too early to discuss procedural fairness in full detail, since both cases are currently in experimental phases, and processes are under development. Regarding explicability, we saw explicit design choices for algorithms and ways of working that are understandable and explainable: a simple standard classification model instead of, e.g., a complex random forest algorithm (Case A); and an algorithm that starts with experts' knowledge rather than with, e.g., machine learning (Case B).
Our case studies have several limitations. First, they deal with algorithms that are currently being used in Dutch government agencies. So, the algorithms we found and studied are relatively simple [44], compared to systems with advanced algorithms, e.g., with deep learning or reinforcement learning. We did, however, discuss potential, future developments of more advanced algorithms, e.g., with regards to their explicability. In addition, our focus on algorithms that are used by the Dutch government meant a focus on government agencies and civil servants. We can assume that they have fairly benign intentions and fairly careful ways of working. Our findings could have been rather different if we had studied algorithms that are being developed and deployed in another domain, e.g., a domain driven by short term financial profits or a company with little interest in social responsibility.
Furthermore, the algorithms studied were in early and experimental phases [44]. As a consequence, the empirical parts of our case studies focused on impacts that are closely related to the design and application phases. We did, however, explore less immediate impacts, which may happen after some time. Our explorations are similar to the cases discussed by O'Neil (2016), e.g., how the deployment of algorithms may propagate and exacerbate existing inequalities and harm those with less power disproportionally. In general, it remains challenging, however, to anticipate higher-order impacts, like the corrosive effects that online social networks during can have on people's news consumption, on political polarization and on behaviours during elections.

Unintended, undesirable, higher-order effects
Above, we looked at two cases in which the people involved aim to contribute to a societal or common good and work carefully. They followed principles like respect for human autonomy, prevention of harm, fairness and explicability [21]. This can be challenging and complex enough. Below, we will explore one further level of complexity, namely potential unintended, undesirable, higher-order effects of using algorithms. Such effects can occur, regardless of good intentions and a careful approach. That is why we call them 'unintended, undesirable'. We propose that such an exploration is needed if we take Responsible Innovation (RI) seriously. Stilgoe et al. [40] argued that RI entails four key dimensions: anticipation, responsiveness, inclusion and reflexivity.
We will focus on the first two: anticipation and responsiveness. 24 .: 1572). Responsiveness is a necessary supplement to anticipation; one needs to be able to respond to issues that one anticipates. In addition, responsiveness requires anticipating changing circumstances to be able to respond adequately.
For our exploration of potential unintended, undesirable, higher-order effects, we will stay in the domain of algorithms that are used for decision support in the domain of justice and security. Let us further assume that the people involved in the design and deployment of these algorithms have good intentions and work carefully. They will typically focus on intended and desirable effects that the algorithm can help to realize. They will also make efforts to anticipate unintended, undesirable, first-order effects that can happen, e.g., when different values conflict in a relatively direct manner. When it is obvious that a lack of transparency can negatively impact fairness, people will work to improve transparency, to promote fairness.
They will, however, by definition, find it hard to anticipate unintended, undesirable, higher-order effects. Now, what do we mean with higher-order effects? One way to understand these comes from systems thinking. In systems thinking one views different phenomena as parts of a larger system and looks at the relationships between these phenomena [27]. The feedback loop is a key concept here: imagine that A influences B, then information about the status of B regulates the influence of A on B. Feedback loops can be balancing; they steer parts of a system to some dynamic equilibrium. Think of the balancing feedback of a thermostat in a heating system. Or they can be reinforcing; they make parts of a system go increasingly up or increasingly down. They are sometimes referred to as virtuous cycles or viscous cycles. We are often able, to some extent, to anticipate first-order effects, like the influence of A on B. We are, however, much less able to anticipate higher-order effects, like the behaviour of a system that has multiple elements, multiple relationships and multiple balancing and reinforcing feedback loops.
We can illustrate what we mean with unintended, undesirable, higher-order effects with the anecdote of the Cobra effect. 25 In the time of the British rule of colonial India, the British wanted to get rid of venomous cobras in Delhi and offered a bounty for every dead cobra. The (first-order) intended and desirable effect was that people killed snakes for this reward. People, however, also began to breed cobras to claim their rewards. The government found out and stopped the reward program. The breeders then let their cobras go free, which were now worthless-which worsened the cobra plague. Officials could maybe have anticipated this effect if their analysis of the system had included variables and feedback loops for supply and demand, and for motivation and behaviour. Now, if we envision a situation in which people design an algorithm. They focus on values A and B, and carefully combine and balance A and B. But then, after the system has been in use for a while, value C pops up, in a very disturbing way, seemingly out of nowhere. Or they create a careful balance between values P and Q, and then, as people use the system in ways slightly different from what they had intended, value Q goes off the rails, unexpectedly, and the balance between P and Q is gone.
A similar effect is known as Goodhart's law, 26 named after economist Charles Goodhart: 'When a measure becomes a target, it ceases to be a good measure.' Informally, this is known as the KPI effect: when an organization introduces a Key Performance Indicator, the people on the floor find (creative) ways to satisfy this KPI-sometimes, however, in ways that hamper what the KPI tries to achieve. The organization meets its KPIs, but fails to realize the underlying goals. This draws attention to the need to be very careful when articulating, quantifying and measuring the intended, desirable outcomes one wishes to achieve.
Below, we will explore several potential unintended, undesirable, higher-order effects that may occur in the design and deployment of algorithms for decision support in the domain of justice and security. Our exploration is based on several general findings from the cases discussed above. (Please note, however, that our exploration is not intended as an assessment of what might happen in these particular cases.) We will, again, follow the principles of the High-Level Expert Group on Artificial Intelligence [21].

Respect for human autonomy
The deployment of algorithms can alter people's ways of working and thus affect their autonomy. In the introduction we referred to algorithms in decision support, where agents need to combine the algorithm's output with their professional discretion. The extremes of always strictly or slavishly following the algorithm and of always neglecting or overruling its output are rather ineffective or inefficient.
We may be able to anticipate unintended, undesirable, first-order effects and respond appropriately, e.g., by enabling people to inspect, question, modify or correct its functioning. But how may we anticipate and respond to higherorder effects? Shneiderman [38] provided a diagram that may be helpful-see Fig. 1. He advised exploring the topright quadrant of high computer automation and high human control to create 'reliable, safe and trustworthy' AI systems (although there may be good reasons, in specific cases, to go for other quadrants: for example the combination of high human control and low computer automation for piano playing ('human mastery') or the combination of high computer automation and low human control for airbags ('computer control').
One way to explore potential, unintended, undesirable, higher-order effects, is to explore various ways in which the system and its usage may, over time, unintentionally, move across the plane in Fig. 1, away from the top-right quadrant. It may drift to excessive human control, where people need to micro-manage the system, which could be very inefficient, or even dangerous, e.g., in a situation in which a selfdriving car very suddenly requires the driver, who is busy doing something else than driving, to take control of the steering wheel. Or towards excessive automation, where too many tasks are delegated to the system, so that people can no longer monitor its functioning in any meaningful way, or the system performs tasks that do require human perception, discretion and judgement. Computers are notoriously bad at the latter; they cannot take into account context and they lack common sense [26,35].
Or the system may drift away towards too little human control; this can also happen because of people's evolving practices, e.g., when people have learned to follow the algorithm's output unthinkingly and routinely 'click the okay button'. Or it may drift towards too little computer automation; people then need to perform too many routine tasks and effectively waste their time and energy-or worse, start to make mistakes, e.g., because of reduced concentration.
Another issue regarding respect for human autonomy is the combination of explicit knowledge and tacit knowledge. The former refers to data that is used as input for an algorithm and is associated with computer automation. The latter refers to information in people's minds and bodies, which is associated with human control. Both types of knowledge are relevant for algorithms in decision support. Imagine an organization that procures such a system. They will typically want to realize benefits that outweigh the costs associated with using the system. Over time, they may unintentionally slide towards preferring explicit knowledge and computer automation over tacit knowledge and human controlit would be silly to buy an expensive system and not use it. There is ample (anecdotal) evidence of people feeling unhappy when their tacit knowledge, their abilities, skills, expertise, experience, are not valued and replaced by automation. This may even lead to an unintentional, undesirable focus on means, and losing sight of ends. Choosing for automation brings risks for the unintended and undesirable effect-over the course time-of prioritizing explicit knowledge and computer automation at the expense of tacit knowledge and human control.

Prevention of harm
A first step in anticipating and preventing potential harms involves assessing and evaluating the different pros and cons of using an algorithm (a future situation) in comparison to not using an algorithm (the current situation). It is indeed possible that not using the algorithm causes more harm than using it. This would be an argument in favour of deploying this algorithm. In addition, one would need to design and deploy measures to increase its benefits and to decrease its drawbacks.
Another way to anticipate and prevent potential harms of algorithms, is to create an error matrix. Such a matrix plots true positives, true negatives, false positives and false negatives. These errors can be viewed as first-order unintended, Fig. 1 'Reliable, Safe, and Trustworthy' AI requires appropriate levels of computer automation and human control (adapted from [38] undesirable effects. One way to anticipate higher-order unintended, undesirable effects is to explore how this error matrix may evolve, as it is modified and fine-tuned over the course of time, either by people or 'by itself', in cases of machine learning.
For example, there may be unintentional incentives to promote the occurrence of false negatives. If we look back at Case A, this would refer to a person not being offered support to pay their fines, whereas this person would actually need such support. For the sake of argument, let us assume, in more general terms, that false negatives refer to advice that 'no action' is needed, which typically costs less money and time than action. Moreover, false negatives are likely to stay undetected; they typically do not appear in weekly, quarterly or yearly reports. This may unintentionally nudge the organization, over time, to modifying the system towards producing more false negatives-which may hamper the organization's overall goals. Alternatively, a system may unintentionally evolve, over time, towards producing more false positives. If we look back at Case B, this would refer to a person incorrectly receiving a high likelihood of violent behaviour, and an advice to act cautiously and carefully. For the sake of argument, let us assume, in more general terms, that false positives entail taking action, which costs money and time. Organizations typically steer away from costs and, unintentionally and over time, may modify the system towards producing less false positives. Having fewer errors does not need to be problematic, of course. It can, however, be a problem if the modified algorithm's reduction of false positives leads to more false negatives. In Case B, this would refer to predictions of non-violent behaviour for people who will actually behave violently-an unintended and undesirable effect.
There remain questions regarding a fair balance between having false negatives, which may hamper the organization's main goals, or false positives, which may involve wasting money and time, and harms.
One particular example of an unintended, undesirable, higher-order effect could be a drift towards 'low hanging fruits'. An organization may gain insights in 'what works best' and drifts towards prioritizing cases that are very clearly true positive. In Case A, this would refer to people who are very willing and very able to pay their fines. One might say that they do not really need to be offered support. The organization, however, can be very successful if it targets them. Such a priority for 'low hanging fruits' may lead to a neglect of people who are less clearly true positive, who will miss out on the support they actually need.
Another higher-order, unintended harm can manifest when organizations collect and use data from multiple data sources, especially if these data sources pertain to different domains. Imagine an insurance company collecting data about their customers' life styles. Or a care provider collecting data on their patients' finances. Combining data from different sources is not necessarily always a bad idea. There are situations in which the public expects that different public service organizations collaborate and share information-of course following principles of legality and proportionality. The public will criticize the organizations involved if not collaborating and not sharing information resulted in harm that could have been prevented precisely by collaborating and sharing information.

Fairness
It almost goes without saying that we expect government organizations to comply to legislation and to ensure substantive fairness, an 'equal and just distribution of both benefits and costs' and procedural fairness, which refers to people's abilities 'to contest and seek effective redress' [21], p 12). Making the algorithm substantively fair is necessary but not sufficient. The organizations involved will also need to organize procedural fairness, e.g., by organizing processes via which people at the receiving end of the decisions supported by the algorithm, are able to critique these decisions. We will further discuss this topic below, under explicability.
Our discussion of harms (above) focused on individuals. Harms can, however, also affect groups of people. In such cases, we can view these harms as systemic unfairness. There are ample examples of unfairness being repeated, propagated or exacerbated through the usage of algorithms [32]. Imagine an algorithm that puts a specific label on a relatively large number of people in a specific socio-economic or cultural group, then this may lead to stigmatization or discrimination of that group. There is a risk that people are reduced to labels and that the labels get reified. In very general terms, we can point at four sources for such unfairness: • the data that the algorithm uses as input-these data may refer to current unfair situations; when these data are used to train an algorithm, these unfair situations are likely to be repeated; • the algorithm itself, which can function unfairly-intentionally or unintentionally; • the process in which the algorithm's output is usedwhich affects procedural fairness; • or the feedback loop, which feeds back information about the application of the algorithm's output, so that the algorithm, or processes around it, can be corrected and modified.
This feedback loop is critical. 'Without feedback', Cathy O'Neil argued, 'a statistical engine can continue spinning out faulty and damaging analysis while never learning from its mistakes' (2016: p. 7). She stressed the need for properly functioning feedback loops, otherwise we risk 'confusing 1 3 [algorithms'] findings with on-the-ground reality' (ibid: p. 12).
Finally, we must look at the larger picture. Promoting fairness in the design and deployment of algorithms must go hand in hand with questioning and critiquing the larger context in which these algorithms are used [3][4][5]. For example, in the infamous COMPAS case, 27 of an algorithm that assesses the likelihood of recidivism, one needs to make the algorithm more fair (or less unfair), but also make room to question and critique the role of racial discrimination in the judiciary system, and the larger systemic, racial inequalities and injustices in society.

Explicability
Explicability can be understood as having instrumental value in that it contributes to other values or principles. According to Hayes et al. [20], explicability (or in their words: 'accountability/transparency') contributes to autonomy and to fairness. Autonomy, of both those who use the algorithm ('human decision makers') and those at the receiving end ('data subjects'), critically depends on their abilities to understand and explain the algorithm's functioning. Moreover, explicability is critical for people's abilities to question and critique the algorithm's fairness: to find an appropriate balance of agency between people and technology; to inspect and evaluate the various types of errors; and to organize processes via which people can critique and provide pushback, and seek correction and redress. There are several domains of knowledge dedicated to promoting explicability, e.g., XAI (Explainable AI) and FAT (Fairness, Accountability and Transparency; which focuses on more than explicability)a discussion of which is outside our scope.
Two issues, which we also encountered in our cases, are, however, worth mentioning. First, there is the 'problem of many hands' [8]. This refers to the problem that in a complex system, with many actors and many moving parts, it can be hard to attribute responsibility. If we want to explore unintended, undesirable, higher-order effects, we need to look at the larger processes in which algorithms are used, at organizations that use the algorithms. A decision based partially on an algorithm's output can only be understood and explained if the processes and organization are understandable and explainable. One will need to avoid situations where citizens' questions get a reply like: 'Computer says no. I don't know why. You will need to go elsewhere. I don't know where. ' Second, there are different types of algorithms with different properties and levels of explicability. In the two cases, we saw that the people involved chose for a simple decisiontree rather than a complex deep-learning (Case A), and for using 'expert knowledge' rather than 'data mining' (Case B); in both cases, they chose the former because it typically provides better explicability than the latter. Looking forward, it would be wise to keep an eye on developments in FAT and XAI; these fields may provide solutions that combine autonomy, fairness, accuracy and privacy. Organizations need to explore, innovate, experiment and learn.

Discussion and conclusion
We looked at two positive examples of using algorithms in decision support systems in the domain of justice and security. We discussed the ways in which these initiatives followed the principles put forward by the High-Level Expert Group on Artificial Intelligence [21]: respect for human autonomy, prevention of harm, fairness, and explicability. We then explored potential, unintended, undesirable higher-order effects. We identified and discussed a range of such effects-which might occur, despite good intentions of the people involved and their careful approaches. Based on our exploration, we speculate that, in more general terms, such effects become, to some Fig. 2 Framework for promoting anticipation and responsiveness regarding potential unintended, undesirable, higherorder effects of algorithms extent, better accessible for anticipation and responsiveness, if we zoom-out. Zooming-out refers to both space and time: we need to zoom-out to see the algorithm not in isolation, but within its context, within the process and organization in which it is used; and we need to zoom-out to envision the algorithm and its usage develop over time, while it is deployed in practice.
We can visualize the main findings of our explorationsee Fig. 2. The blue box represents the algorithm's functioning and immediate effects and feedback loop; this is typically 'in scope' of the people involved in design and implementation. The orange box and arrow represent the usage of the algorithm's higher order impacts and higherorder feedback loops; these are not always 'in scope' and are likely to happen over the course of time and therefore not easy to anticipate and respond to. This figure meant as a tentative framework to explore higher-order effects-as a reminder for people involved in the design and deployment of algorithms to follow the four principles put forward by the High Level Expert Group on AI (2019): respect for human autonomy, prevention of harm, fairness, and explicability.
Here are several tentative recommendations, based on the findings from our exploration-needless to say: there may be many other issues in other cases, which may lead to different recommendations: • Input: one can promote fairness by preventing bias, both in the data that are used in training the algorithm and in the data that the algorithm uses in deployment; one can promote explicability by being transparent about the data that go into the algorithm; more generally, one needs to look at the larger picture of data collection, e.g., which data sources are used and which are not used-it is wise to question assumptions about the system's boundaries: which data are included and which are excluded; • Algorithm: one can promote respect for human autonomy by considering to use experts' knowledge in the design of the algorithm, rather than machine learning; one can promote prevention of harm by analysing false positives and false negatives and their respective harms; one can promote explicability by carefully choosing a specific type of algorithm (they can greatly differ regarding explicability); and by explaining the algorithm's functioning in a vocabulary that is appropriate for the addressee; • Output: one can promote respect for human autonomy by enabling the people who use the algorithm's output to use also their professional discretion, in combination with the algorithm's output; promoting such human autonomy in the process ('human in the loop') is also critical to prevent harm, to promote fairness, and to promote explicability, assuming that people are able to check and mitigate harmful outcomes and impacts of the algorithm.
• Feedback: one can prevent harm and promote substantial fairness by organizing processes around the algorithm's deployment that enable both agents ('human decision makers') and people at the receiving end ('data subjects') [20] to provide pushback, i.e. to make corrections or modifications, when necessary; this needs to goes hand in hand with promoting procedural fairness and explicability, e.g., by organizing processes that enable agents and citizens to engage in a fruitful dialogue, if needed. • Higher order impacts: one can monitor potential, unintentional or undesirable effects as they happen over the course of time. This would require zooming-out to see not only the algorithm's immediate effects, but also the effects it has on processes in the wider organization that deploys the algorithm, and the broader impacts this has in society. • Higher order feedback: one can promote anticipation and responsiveness by putting mechanisms in place that feedback information on these higher-order impacts to the organization that deploys the algorithm. One can do this, e.g., by organizing continuous improvement (CRISP-DM) or frequent, critical reviews of objectives and realized outcomes.
To some extent, such high-order, unintended, undesirable consequences can be anticipated, e.g., by exploring possible future scenarios [31,34]. Anticipation, however, remains notoriously difficult [43]. In addition, one can move to responsiveness, 'a capacity to change shape or direction in response to stakeholder and public values and changing circumstances' [40], p. 1572. The time dimension is critical here since higher-order effects typically happen over the course of time. One way to promote responsiveness is by organizing small-scale experiments, e.g., 'testing zones' or 'living labs', to try out and evaluate technologies and applications. These experiments can involve diverse actors, e.g., developers, suppliers, customers, users and societal stakeholders, and cover different domains, e.g., technology, ethics, organizational culture, societal expectations and norms, and economics. Moreover, such experiments will need to be designed and executed with care, with bespoke conditions and for a limited period of time [41].
Despite such experimentation, some high-order effects will only materialize once systems are operational, or after being in operation for some time [42]. Dealing with such effects requires continued monitoring of potential unintentional, undesirable high-order effects and procedures to respond to them, e.g., through redesign of the system or adapted use of the system. De Reuver et al. [10] propose an adaptation to the traditional Value-Sensitive Design (VSD) methodology to better address unanticipated effects by extending VSD to the full life cycle for digital platforms that might also be useful for algorithms. Above, we did already mention the Cobra effect and Goodhart's law: an organization puts measures in place to realize a certain objective, then things take an unexpected and different turn, and the measures backfire and work against that very objective. We hope our exploration and tentative recommendations can support people who are involved in the design and deployment of algorithms to promote anticipation and responsiveness. Besides these, Responsible Innovation also requires inclusion, e.g., by creating more diverse project teams or by involving stakeholders [39], and reflexivity, i.e. 'holding a mirror up to one's own activities, commitments and assumptions' [40], p. 1571). Looking forward, we can imagine further research into potential, unintended, undesirable higher-order effects by drawing from traditions like Technology Assessment [18,23,33] and Organizational Learning [1,37,43].

Conflict of interest
The authors declare that they have no conflict of interest.
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