This book was first published in 1988. B. F. Skinner was arguably the most important and influential psychologist of the last century. Yet in his long and distinguished career he consistently declined to be engaged by his critics. In his ninth decade, he elected to confront them all: cognitivists, ethologists, brain scientists, biologists, linguists, and philosophers - close to one hundred and fifty scientists and scholars from the entire spectrum of behavior-related disciplines around the world. Skinner's views on consciousness, language, problem solving, evolution, biology, brain function, computers, theory and explanation, presented in six seminal papers, are analyzed, criticized and explained in the 'open peer commentary' format of the Behavioral and Brain Sciences journal. The result is a remarkably lucid and revealing historical record of Skinnerian thinking and its impact on psychology and its allied disciplines. General readers, students, professionals and historians will find this unique intellectual exchange an invaluable resource.