Far from claiming he has unearthed the final truths about disunitarianism Brännmark aims to generate more discussion about the fundamental methodological choices in medical and indeed, more generally, in applied ethics (Brännmark 2019). He presents disunitarianism as a claim about the highest level of abstraction of ethical principles eligible to be employed within a specific domain. According to disunitarianism all eligible principles, even the most abstract ones, must still be domain specific. Unitarians on the other hand assume that specification starts with abstract top-level ethical principles down to domain-specific principles and then further down to specific ethical judgments. Accordingly, they conceptualize all fields of domain-specific ethics as instantiating the same abstract ethical theory as their common ethical core. Disunitarians, in contrast, do away with this shared abstract core and start specification at the level of domain-specific principles, whereby—at least theoretically—they can organize each domain-specific ethics subdiscipline completely different, as long as its principles are appropriate to the domain at hand (Brännmark 2019).
Obviously, the disunitarian claim leans heavily on the concept of domain, which Brännmark defines as a set of “interconnected practices” (Brännmark 2019). In order to further delineate the concept of practices Brännmark references Rawls’ notion of “any form of activity specified by a system of rules which defines offices, roles, moves, penalties, defenses, and so on, and which gives the activity its structure” (Rawls cited in Brännmark 2019). Brännmark admits that the demarcation of domains as sets of interconnected practices is likely to be less than razor-sharp. For practical purposes, however, he maintains that the domains covered by currently existing fields of applied ethics, such as business ethics, environmental ethics, and medical ethics, give reasonably clear examples of what is meant by the notion of domain. Moreover, the main point is that disunitarians do not resort to domain-transcending ethical theory (Brännmark 2019).
The question is whether the concept of domain is herewith sufficiently demarcated. After all, the concept seems to be pivotal when it comes to a proper understanding and implementation of the disunitarian approach, which bans summoning domain-transcending theory to one’s aid when engaging in domain-specific ethical theorizing. In order to go about in accordance with the disunitarian methodology it is thus imperative to have a clear idea of the contours of the domain at hand.
Assuming, for example, one endeavored to analyze a certain ethical issue in nephrology, disunitarianism would not allow consulting any ethical principles going beyond the proper domain that subsumes the field of nephrology. In order to be a good disunitarian it is therefore important to have a clear idea of the proper domain and thus to know which levels of abstraction of ethical theory are inadmissible. Here are some candidates of what might be seen as the proper domain subsuming nephrology in ascending order of generality: (1) internal medicine, (2) medicine, (3) healthcare, (4) the complex of practices in healthcare and the life sciences, or (5) some other even more general domain. If one were to choose (1), it would be precluded to summon any principles of medical ethics to one’s aid in the analysis of ethical issues in nephrology as these would count as domain-transcending. If one were to pick (2), one would be allowed to work with principles of medical but not healthcare ethics. If one selected (3), it would be permissible to use principles of medical and healthcare ethics but not bioethics (assuming these also cover the life sciences). This example illustrates that presuppositions about the demarcation of domains have practical consequences when engaging in disunitarian ethics. More clarity on the concept of domain would therefore be helpful.