Abstract: Introduction: Aspects of Rationality – Theoretical Rationality: Its Sources, Structure, and Scope – Practical Aspects of Theoretical Reasoning – Procedural And Substantive Practical Rationality – Humean Rationality – Kant: Rationality as Practical Reason – Duty, Rationality, and Practical Reasons – Bayesianism – Decision Theory and Morality – Rationality and Game Theory – Practical Reasoning and Emotion – The Rationality of Being Guided by Rules – Motivated Irrationality – Paradoxes of Rationality – Rationality and Psychology – Gender and Rationality – Rationality and Persons – Rationality, Language, and the Principle of Charity – Rationality and Science – Economic Rationality – Legal Theory and the Rational Actor – Rationality and Evolution

Keywords: decision theory, emotion, evolution, game theory, gender, nature, paradox, person, practical reason, rational, reasoning, scope, theory, aspects, language, persons, principle, rules, morality, rationality, reason