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KBAlertz.com: (74978) - 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...

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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
©2005-©2007 Microsoft Corporation. All rights reserved. Terms of Use | Trademarks



Article ID: 74978 - Last Review: January 18, 2007 - Revision: 4.5

Definition of Microsoft Project constraints

View products that this article applies to.
This article was previously published under Q74978

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
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 Standard 2002
  • 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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Keywords: 
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