Finish-to-StartWith a finish-to-start (FS) and zero lag, the successor activitycan start immediately after or later than the predecessor activityfinishes, so that the earliest possible start time of the successor isthe next day of the predecessor’s EFT. For example, as shown inFig. 2, Activity A finishes at the end of Day 3, thus its successorswith FS:0 can start at the beginning of Day 4 or later. SinceActivity B belongs to Calendar 2, it cannot start on Day 4. ActivityB can start at the beginning of Day 8, which is the nextavailable working day on Calendar 2.With a FS and positive lag, the successor can start at the lagtime after or later than the predecessor finishes, so that the earliestpossible start time of the successor is the next day of the predecessor’sEFT plus the amount of lag time counted by workingdays on the predecessor’s calendar. For example, as shown in Fig.3~a!, Activity A finishes at the end of Day 3, thus its successors