Do the insights into human behavior generated by laboratory experiments hold outside the lab? This is a crucial question that naturally troubles both experimentalists and their critics. We address this question by adopting Popper's injunction that hypotheses should be tested, not by seeking...

This paper reviews some of the key responses to Hahn's famous retiring remarks and argues that none has satisfactorily addressed Hahn's suggestion that a discipline does not need to consciously discuss its foundations as it can rely on an evolutionary process to select them. The paper presents a...