My analytical unit was not one student but the set of interpretive repertoires used to talk about the PBL process. Willig (2001, p. 95) clarifies that the function of interpretive repertoires as used by a range of discourse analysts, is ‘to construct
alternative, and often contradictory, versions of events’. For example, one interpretive repertoire used was ‘PBL process: Not O.K. confusion versus O.K. confusion’.