Abstract
Complex search tasks—such as those from the Search as Learning (SAL) domain—often result in users developing an information need composed of several aspects. However, current models of searcher behaviour assume that individuals have an atomic need, regardless of the task. While these models generally work well for simpler informational needs, we argue that searcher models need to be developed further to allow for the decomposition of a complex search task into multiple aspects. As no searcher model yet exists that considers both aspects and the SAL domain, we propose, by augmenting the Complex Searcher Model (CSM), the Subtopic Aware Complex Searcher Model (SACSM)—modelling aspects as subtopics to the user’s need. We then instantiate several agents (i.e., simulated users), with different subtopic selection strategies, which can be considered as different prototypical learning strategies (e.g., should I deeply examine one subtopic at a time, or shallowly cover several subtopics?). Finally, we report on the first large-scale simulated analysis of user behaviours in the SAL domain. Results demonstrate that the SACSM, under certain conditions, simulates user behaviours accurately.
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Notes
- 1.
In this paper, we refer to a model as a model of user behaviour.
- 2.
This research has been supported by NWO projects SearchX (639.022.722) and Aspasia (015.013.027).
- 3.
We consider a search session as interactions with a search interface, which can include the issuing of multiple queries—and the examination of multiple documents.
- 4.
Agents are simulated users that are able to make judgements as to the relevancy/attractiveness of information without recourse to relevance information [29].
- 5.
Refer to Sect. 4.3 for more information on the use of Wikipedia articles.
- 6.
https://github.com/ArthurCamara/CHIIR21-SAL-Scaffolding/blob/master/data/blocklist.txt (All URLs last accessed January 18\(^\mathrm{th}\), 2022.).
- 7.
As noted in Sect. 3, we do not have explicit relevance judgements.
- 8.
As an example, the following are extracted keywords for the topic Ethics: ethical, ontology, propositions, consequentialism, normative and principles.
- 9.
This number was decided experimentally, as it showed to be the best to distinguish between the different methods trialled.
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Câmara, A., Maxwell, D., Hauff, C. (2022). Searching, Learning, and Subtopic Ordering: A Simulation-Based Analysis. In: Hagen, M., et al. Advances in Information Retrieval. ECIR 2022. Lecture Notes in Computer Science, vol 13185. Springer, Cham. https://doi.org/10.1007/978-3-030-99736-6_10
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