The philosopher Patrick Suppes has developed a unique and influential approach to studying the foundations of sciencehe combines an understanding of the main principles of scientific theories in axiomatic terms and formal models with a hands-on approach. While moving the study of the philosophy of science out of the parlor and into the lab, he often comes up with original results from the psychology of learning to the theory of measurement and quantum mechanics. This book searches for a common thread in Suppes's multifaceted work through a series of conversations with the man himself and illuminates many of the more challenging aspects of his philosophy.