Deltek Open Plan Help

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Early and Late Dates

Time analysis calculates four dates for each activity in a project.

These dates are as follows:

  • Early Start: The earliest date on which an activity can start
  • Early Finish: The earliest date on which an activity can finish
  • Late Start: The latest date on which an activity must start if the project completion date and target dates are to be met
  • Late Finish: The latest date on which an activity must be completed if the project completion date and any finish target dates are to be met

Open Plan calculates the early start and early finish dates in what is known as the forward pass through the project data. During the forward pass, Open Plan starts at the Time Now date and moves forward through the project in the order determined by the relationships between the activities. As it moves through the project, Open Plan adds the durations of the individual activities as well as any lags on the relationship between them.

Open Plan calculates the late start and late finish dates in what is known as the backward pass. During the backward pass, Open Plan starts at the project finish date and considers the relationships between activities to move through the project in reverse order. As it moves through the project in reverse, Open Plan subtracts the durations of the individual activities and considers any lags between them.