Similarly, Activities B1 and B2 in the AON are two components making up the original Ac- tivity B in the PDM network. It is noteworthy that to represent the SF logic, Activity B2 in the AON is actually a dummy, which has zero duration and denotes the finish milestone for Activity B. Thus, the duration ofActivity B1 in theAON network is the same as that of Activity B in the PDM network i.e., b. To simplify mathematical representations, we assume the project start time is zero; a relative origin on the timeline is aligned with early start events onAand B. The equivalency of the two networks in Fig. 5 PDM versus AON in terms of CPM analysis can be analytically proven as will be shown next.