For example, if a piece of key equipment is only available for a few days, activities that depend on it have the same start and finish dates in the forward and backward passes.
The difference between the early start date and the late start date for activities on the critical path is usually the same as the total float, unless the activities are affected by the resource calendars differently in the forward and backward pass. Assign the calculated date as the late start date of the predecessor activity.Refer to the resource calendar (or calendars) that applies to the people and equipment necessary for the activity, and subtract the number of off days that the activity would span on those calendars.Subtract the lag time or add the lead time to the late finish date.Subtract the predecessor activity’s duration from its late finish date.Follow these steps to calculate the late start dates of predecessor activities, assuming finish-start relationships: To calculate late start dates, begin with the project completion milestone and assign that date as the finish date of its predecessor activities. Resource calendars must be considered in the backward pass as well as the forward pass. Subtract the duration of each activity in each path to determine the latest date the activity could begin and still meet the project completion date. The next step is to work through the network diagram from right to left beginning with the mandated completion date, which is a milestone that is set in the project plan. Assign the calculated date as the early start date of the successor activity.Refer to the resource calendar (or calendars) that applies to the people and equipment necessary for the activity, and add the number of off-days that the activity would span on those calendars.Add the lag time or subtract the lead time.Add the predecessor activity’s duration to its start date.Follow these steps to calculate the early start dates of subsequent activities, assuming finish-start relationships: To calculate early start dates, begin with the project start date and assign that date as the start date of activities that have no predecessor activities. The estimate considers durations and resource availability calendars. The early start date for an activity is the earliest date the activity can begin. The dates derived by this method are the early start (ES) dates. Starting dates can be assigned to each activity by doing a forward pass proceeding from left to right in the network diagram beginning with the project start date.
0 kommentar(er)
