A project can also have negative float, which means the calculated completion date of the last activity is later than the targeted completion date established at the beginning of the project. Any delay in an activity on the critical path would reduce the amount of total float available on the project. Total float is the difference between the finish date of the last activity on the critical path and the project completion date. Floatįloat, sometimes called slack, is the amount of time an activity, network path, or project can be delayed from the early start without changing the completion date of the project. Computer software must be combined with common sense or good judgment. Fortunately, there are computer programs to assist in the process, but the project manager must understand the process well enough to recognize computer errors. Assign the calculated date as the early start date of the successor activity.ĭoing this process manually is error prone and time consuming.Refer to the resource calendar(s) 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.
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