This chapter examines a data fragment for which an analysis has already been reported and which has been held up as a paradigmatic example of a knowledge analysis. Orit Parnafes provides the video that was reanalyzed in the Danish chapter and that originally appeared in Parnafes. The author retranscribed it using the Jeffersonian conventions employed in conversation analysis. Levin and diSessa discusses the notion of force as it is applied in simple mechanics. It gestures in the direction of the 'problem of intersubjectivity. By the 'simplest systematics' algorithm, a single turn may include one or more embedded pauses and might consist of multiple 'turn construction units' (TCUs) that may take the grammatical form of sentences clauses, phrases. Parsons' and Schutz's different responses to the problem of intersubjectivity have bearing on the question of how people might go about documenting students' intuitive notions of physical phenomena. Parsons' structural-functional approach in sociology, has adopted a functional approach to studying human problem solving.