Paper: How to Calculate Dates in the Critical Path Method

 

 

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. The Four Basic Calculated Dates are: Earliest Start, Earliest Finish, Latest Start, and Latest Finish.

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. And 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.

* The Ten Essential Formulas are:
- 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)

 

 

 

Table of Contents

1:    Overview: Date Calculation Concepts
  1A:  Date Calculation Specifications
  1B:  Four Basic Calculated Dates
  1C:  Date Calculation Processes
  1D:  Date Calculation Procedures
  1E:  Date Calculation Variables
  1F:  Date Calculation Arithmetic Formulas
  1G:  Arithmetic Formula Identifiers
  1H:  Arithmetic Formula Abbreviations
 
2:  How to Calculate EARLIEST START 
  2A:   Condition ES|dr: Earliest Start thru Default Restriction(s)
     2A1: Date Calculation Process, in Plain English
     2A2: Date Calculation Technical Specifications and Formulas 
  2B:   Condition ES|sr: Earliest Start thru Start Restriction(s)
     2B1: Date Calculation Process, in Plain English 
     2B2: Date Calculation Technical Specifications and Formulas  
  2C:   Condition ES|mx: Earliest Start thru Restriction Type Mixture
     2C1: Date Calculation Process, in Plain English
     2C2: Date Calculation Technical Specifications and Formulas
  2D:   Condition ES|no: Earliest Start thru No Restriction Linkages
     2D1: Date Calculation Process, in Plain English
     2D2: Date Calculation Technical Specifications and Formulas
 
3:   How to Calculate EARLIEST FINISH
  3A: Condition EF|du: Earliest Finish thru Activity Duration
     3A1: Date Calculation Process, in Plain English
     3A2: Date Calculation Technical Specifications and Formulas
  3B: Condition EF|fr: Earliest Finish thru Finish Restriction(s)
     3B1: Date Calculation Process, in Plain English
     3B2: Date Calculation Technical Specifications and Formulas
 
4:   How to Calculate LATEST START
  4A: Condition LS|du: Latest Start thru Activity Duration 
 
     4A2: Date Calculation Technical Specifications and Formulas 
 
     4B1: Date Calculation Process, in Plain English  
     4B2: Date Calculation Technical Specifications and Formulas 
 
5: How to Calculate LATEST FINISH
  5A: Condition LF|dr: Latest Finish thru Default Restriction(s)
     5A1: Date Calculation Process, in Plain English 
     5A2: Date Calculation Technical Specifications and Formulas  
  5B: Condition LF|fr: Latest Finish thru Finish Restriction(s) 
     5B1: Date Calculation Process, in Plain English 
     5B2: Date Calculation Technical Specifications and Formulas  
  5C: Condition LF|mx: Latest Finish thru Restriction Type Mixture 
     5C1: Date Calculation Process, in Plain English 
     5C2: Date Calculation Technical Specifications and Formulas
  5D: Condition LF|no: Latest Finish thru No Restriction Linkages
     5D1: Date Calculation Process, in Plain English 
     5D2: Date Calculation Technical Specifications and Formulas  
 
6: Date Calculation Computational Rules
  6A: Computational Rules for Computing Earliest Start
  6B: Computational Rules for Computing Earliest Finish
  6C: Computational Rules for Computing Latest Start
  6D: Computational Rules for Computing Latest Finish
 
7: Convenient Reference Information
  7A: Dominant/Cognitive Terminology Conversion Table
 
8: Summary of Date Calculation Formulas
  8A: Arithmetic Formulas: Start-of-Day or End-of-Day Perspectives
  8B: Arithmetic Formulas: Point-of-Day Perspective 
 
9: Definitions of Terms Used in this White Paper

 

Content Features

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

 

  • Item #: WPB-KI-13
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