 Scenarios formalize the event nucleus of Moens and Steedman (1988). Every accomplishment takes the same form of scenario, the only differences being that the individual scenarios involve different preparatory processes (run, build, etc.), incremental themes (distance\((x)\), house\((x)\), etc.) and resultant states. Furthermore, it is obvious that the preparatory process run, an activity, is a proper part of scenario (54). The simpler activity scenario can be easily arrived at if we remove clauses (d)–(f) from (54). We are now in the position to solve the imperfective paradox avoiding the problems discussed in  section 6.  Both a past progressive activity sentence as in (55a) and a past progressive accomplishment sentence (55b) will trigger a discourse update as stated in integrity constraint (55c). 