This text offers an introduction to the field of psychology of with a strong focus on the social aspects of decision making processes. Highlighting the role of psychological experimentation, this work is written in a style that should be equally accessible to the introductory psychology student, lay person, or the professional. A feature of the text is the Reader Survey that allows users to compare their answers with the responses given by people in the original studies. Also included are brain teasers, puzzles, and examples and applications.