This document provides an overview of assessment centers, which are used in human resource management for prediction, diagnosis, and development. It describes a typical assessment center process involving multiple trained assessors observing and evaluating candidates' behaviors in simulation exercises relevant to key dimensions of performance. Assessment centers are compared to other assessment methods and their use in various HR functions like selection, promotion, and development is discussed. Considerations for the organizational environment and criticisms of assessment centers are also reviewed. The document examines continuity and change in assessment centers in light of trends in work, organizations, and the global business environment.