This encyclopedia traces the development and future of research on political decision making through an exploration of its central theoretical approaches, methodologies, and substantive topics of perennial interest. The focus is on political decision making as a question of individual psychology: individual preferences, information search, evaluation, and choice. Through peer-reviewed contributions by leading researchers, the encyclopedia provides a general framework for studying political decision making that applies to both everyday citizens and political elites. Under the editorial directorship of David P. Redlawsk and associate editors Cengiz Erisen, Erin Hennes, Zoe Oxley, Darren Schreiber, and Barbara Vis, the Oxford Encyclopedia of Political Decision Making provides the definitive resource of foundational essays on political decision making.