This chapter describes the background to the development of the ‘rational choice perspective’ and reviews its components as summarized in the Introduction to the Reasoning Criminal (Cornish and Clarke, 1986 ) and discussed in more detail in Crime and Justice (Clarke and Cornish, 1985 ). I then describe the main ways in which the perspective has been developed since its formulation before concluding with some refl ections on the benefi ts of giving a greater role in the perspective to affect and emotion.