ICS-White Paper: How to Calculate Dates in the Critical Path Method

SUMMARY

Pages: 46
Illustrations: 18
Bookmarked: Yes
Glossary Items: 26
Product Number: WPB-KI-13
Digital Format: Static PDF

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Introducing the Ten Essential Formulas

This White Paper explains the Ten Essential Formulas that are used to determine the Four Basic Calculated Dates associated with every Activity in a Critical Path Method (CPM) Schedule.

Four Basic Calculated Dates

  • Earliest Start
  • Earliest Finish
  • Latest Start
  • Latest Finish

The Ten Essential Formulas

  • Earliest Start with No Upstream Restrictions
  • Earliest Start thru Default Restriction (Finish-to-Start Dependency)
  • Earliest Start thru Start Restriction (Start-to-Start Dependency)
  • Earliest Finish thru Duration
  • Earliest Finish thru Finish Restriction (Finish-to-Finish Dependency)
  • Latest Start thru Duration
  • Latest Start thru Start Restriction (Start-to-Start Dependency)
  • Latest Finish with No Downstream Restrictions
  • Latest Finish thru Default Restriction (Finish-to-Start Dependency)
  • Latest Finish thru Finish Restriction (Finish-to-Finish Dependency)

White Paper’s Objectives

This White Paper provides an in-depth discussion of Date Calculation Processes, Procedures,  Variables, Arithmetic Formulas, and Computational Rules. These topics are intertwined with one another.

Each of the Four Basic Calculated Dates has its own set of Arithmetic Formulas and Computational Rules. The Arithmetic Formulas and Computational Rules, even for just one Calculated Date, differ depending on the Date Calculation Variables that dictate which Date Calculation Procedures to be followed.