Identifying CPM activities occurring out of logical sequence is important. Being able to analyze such out-of-sequence events is critical to understanding and evaluating delays and disruptions. Properly describing and displaying this analysis to others is imperative for communicating and winning delay or disruption arguments.

This paper begins a long-needed dialogue on analyzing out-of-sequence events in CPM schedules. There are a number of statistical and graphical methods that can be employed to better understand and quantify disruption and confusion on the construction jobsite, as documented in the CPM schedule.