Definition of Microsoft Project constraints

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


                  APPLIES TO
                    Microsoft Office Project Professional 2007
                      Microsoft Office Project Standard 2007
                        Microsoft Office Project Professional 2003
                          Microsoft Office Project Standard 2003
                            Microsoft Project 2002 Professional Edition
                              Microsoft Project 2002 Standard Edition
                                Microsoft Project 2000 Standard Edition
                                  Microsoft Project 98 Standard Edition
                                    Microsoft Project 4.1 Standard Edition
                                      Microsoft Project 4.1a
                                        Microsoft Project 1.0 Standard Edition
                                          Microsoft Project 3.0 Standard Edition
                                            Microsoft Project 3.0a
                                              Microsoft Project 4.0 Standard Edition
                                                Microsoft Project 1.1 for Macintosh
                                                  Microsoft Project 3.0 for Macintosh
                                                    Microsoft Project 4.0 for Macintosh

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                                                    Microsoft Knowledge Base Article

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