Sometimes you need to give some extra time between activities. Lag time is when you purposefully put a delay between the predecessor task and the successor. For example, when the bride and her father dance, the others wait awhile before they join them (Figure 10.6).
Figure 10.6: A lag means making sure that one task waits a while before it gets started. Lead time is when you give a successor task some time to get started before the predecessor finishes (Figure 10.7). So you might want the caterer preparing dessert an hour before everybody is eating dinner.
Figure 10.7: A lead is when you let a task get started before its predecessor is done.
