Increasing numbers of counsellors practise using social constructionist (e.g. narrative, collaborative language systems and solution-focused) approaches. Social constructionist theory holds that matters such as "understanding" are constructed and upheld in human interaction though counselling approaches derived from this theory offer little insight on how this might occur. The present study adopts a theoretically compatible research approach (ethnomethodology and conversation analysis) to empirically examine how understandings were purportedly constructed in counselling interviews. Understanding is depicted in conversational interaction terms, in how speakers make evident to each other that their shared talk is adequate for "moving forward". Counsellor and client perceptions of their participation in researcher-selected passages of "understanding" supplement the analyses. This preliminary study sheds light on some pragmatic considerations useful in practising constructionist forms of counselling.