After reading this chapter, you should be able to:

• Identify the contributions of Franz Brentano, Carl Stumpf, and Christian von Ehrenfels in the development of Gestalt psychology.
• Outline the development of the Berlin school of Gestalt psychology through the work of Max Wertheimer, Wolfgang Köhler, and Kurt Koffka.
• Evaluate the contributions of Kurt Lewin and his students to the development of social psychology and group dynamics.
• Assess the contributions of Fritz Heider to both cognitive and social psychology.