 Granger’s aim is to provide an analysis of ‘scientific practice’. He defines practice as “an activity considered with its complex context, and in particular the social conditions which give it meaning in a world effectively experienced (vécu)” (1968, 6). Science he defines as “construction of abstract models, consistent and effective, of the phenomena” (13). Thus, a scientific practice has both ‘universal’ or ‘general’ components and ‘individual’ components. The analysis of scientific practice requires at least three types of investigations: