Definition of Microsoft Project constraints

Summary

Each constraint type in Microsoft Project can be defined as a formula using the following conventions:

ES = Early Start of the activity
LS = Late Start of the activity
EF = Early Finish of the activity
LF = Late Finish of the activity
SS = Scheduled Start of the activity
SF = Scheduled Finish of the activity
CD = Constraint Date

More Information

The following are definitions of Microsoft Project constraints.

  • As Late As Possible: Schedules the task as late as it can without delaying subsequent tasks. Use no constraint date.
    ES=(Calculated)LS
  • As Soon As Possible: Schedules the task to start as early as it can. Use no constraint date.
    (Scheduled)ES=(Calculated)ES + Delay
  • Finish No Earlier Than: Schedules the task to finish on or after the constraint date.
    EF=CD (if Date<EF)
  • Finish No Later Than: Schedules the task to finish on or before the constraint date.
    LF=CD (if Date<LF)
  • Must Finish On: Schedules the task to finish on the constraint date. Once selected the task will not be moveable on the timescale.
    EF,LF,SF=CD
  • Must Start On: Schedules the task to start on the constraint date. Once selected the task will not be movable on the timescale.
    ES,LS,SS=CD
  • Start No Earlier Than: Schedules the task to start on or after the constraint date.
    ES=CD(if Date<ES)
  • Start No Later Than: Schedules the task to start on or before the constraint date.
    LS=CD(if Date<LS)
For more information on Contraints, please see the "Microsoft Project for Windows Reference" or query on:
winproj and constraint
Properties

Article ID: 74978 - Last Review: Mar 26, 2013 - Revision: 1

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