Rationality is the study of how to think in ways that result in true beliefs and optimal decisions. It encompasses building a theoretical understanding of ideal cognitive algorithms, as well as turning these idealised algorithms into a practise of heuristics, habits and techniques to achieve successful reasoning and decision-making in the real world.
Topics covered in rationality include (but are not limited to): normative and theoretical explorations of ideal reasoning [e.g. 1, 2, 3, 4]; the capabilities and limitations of our brain, mind and psychology [e.g. 1, 2, 3, 4, 5]; applied advice such as introspection techniques [1, 2] and how to achieve truth collaboratively [1, 2, 3, 4]; practical techniques and methodologies for figuring out what’s true ranging from rough quantitative modeling [1, 2, 3] to full research guides [1, 2, 3].