Which year marks the beginning of Experimental Analysis of Behavior as a formal discipline?

The year 1938 is significant in the field of behavior analysis because it marks the publication of B.F. Skinner's landmark book, "The Behavior of Organisms." This work laid the foundation for Experimental Analysis of Behavior as a formal discipline. In this book, Skinner introduced key concepts such as operant conditioning, emphasizing the importance of observable behaviors and the external factors that shape them. This publication is often regarded as a pivotal moment that shifted the focus of psychology towards a more empirical and experimental approach, allowing researchers to systematically study behavior in controlled environments. Skinner's contributions fundamentally shaped the field, and as such, the year 1938 is recognized as the starting point for the establishment of Experimental Analysis of Behavior.