This text investigates the foundational methodologies and empirical frameworks required to conduct rigorous experimental research within the field of psychology. Robert Sessions Woodworth, a pioneer in the development of experimental psychology, synthesizes decades of laboratory findings to establish a systematic approach to behavioral study. The work serves as a comprehensive manual for understanding how variables are isolated, measured, and analyzed in controlled environments. It provides the logical scaffolding necessary for students and researchers to transition from theoretical concepts to practical experimentation.

Experts recognize this work as a foundational text that defined the standard curriculum for experimental psychology for several generations. Readers frequently note the academic density of the prose, which reflects the rigorous scientific standards of its era.