/O Psychology is both a science/practice and an applied/basic research discipline. Appropriately, the APA Handbook of Industrial and Organizational Psychology offers an in-depth examination of the types of behavioral and structural issues that I/O psychologists study every day, from both a theoretical and applied perspective. It explores a natural progression, from how problems are diagnosed to how research is conducted to generate answers to those problems to how interventions are implemented and, finally, to how they are evaluated. It examines what is currently known—including basic historical reviews—and identifies the most pertinent sources of information in both the core and emerging literatures. It pinpoints practical issues, probes unresolved and controversial topics, and looks at future theoretical, research, and practice trends..