On Time and Methodis a systematic, detailed treatment of how temporal factors enter research methodology, how they can affect the outcomes and interpretations of those studies, and how attention to them can strengthen research practice. The authors discuss temporal factors inherent in causal inference and the assumptions researchers make about them, temporal factors involved in choosing and constructing research strategies and research designs, and finally temporal factors in measurement and manipulation of variables. Extended examples on how such factors can operate in actual research programmes are provided.