Presentation from a Town Hall session to discuss favorite forensic schedule analysis methodologies, based on the Forensic Analysis Recommended Practice from AACE International. The Best Practices and Guidelines for Schedule Impact Analysis project is discussing methods.

1. Favorite Delay Analysis Methodologies
Best Practices and Guidelines for Schedule Impact Analysis
Volume 1
Chris Carson, PSP, CCM, PMP
Corporate Director of Project Controls, Alpha Corporation
Managing Director, Scheduling Excellence Initiative
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

2. Based on AACE International Recommended Practice
No. 29R-03, Forensic Schedule Analysis”
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

3. Observational
3.1 Static – Gross
(As-Planned v. As-Built, Single Base)
3.2 Static - Periodic
(As-Planned v. As-Built, Multiple Base)
3.3 Dynamic – Contemporaneous “as-is”
(Contemporaneous Period Analysis)
3.4 Dynamic – Contemporaneous “Split”
(Bifurcated Contemporaneous Period Analysis)
3.5 Dynamic – Contemporaneous “Recreated”
(Contemporaneous Period Analysis, Recreated)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

4. • 3.1 Static – Gross (As-Planned v. As-Built, Single Base)
• Applicable only to simple projects, short in duration, with a CP
that’s unlikely to shift
• Easy to understand, inexpensive to create
• Not suitable to long or complicated projects because the
projects change and the measuring point does not.
• Use when no update schedules available
• Need as-planned schedule and as-built data
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

5. • 3.1 Static – Gross (As-Planned v. As-Built, Single Base)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

6. • 3.1 Static – Gross (As-Planned v. As-Built, Single Base)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

7. • 3.2. Static - Periodic (As-Planned v. As-Built, Multiple
Base)
• Similar to Single Base version
• Measuring it in periods adds little since no new data?
• May find updates useful – but if validated updates available, may
use other methods that assess CP changes
• Need as-planned schedule and as-built data
• May provide for better presentation
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

8. • 3.2. Static - Periodic (As-Planned v. As-Built, Multiple Base)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

9. • 3.2. Static - Periodic (As-Planned v. As-Built, Multiple Base)
Continued next slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

10. • 3.2. Static - Periodic (As-Planned v. As-Built, Multiple Base)
Continued from previous slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

11. • 3.3. Dynamic – Contemporaneous “as-is”
(Contemporaneous Period Analysis)
• Applicable on complicated projects
• Uses contemporaneous updates as new baselines
• If done monthly, then it could be called a “Windows” analysis
• Handles many problems like concurrency well
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

12. • 3.3. Dynamic – Contemporaneous “as-is” (CPA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

13. • 3.3. Dynamic – Contemporaneous “as-is” (CPA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

14. • 3.4. Dynamic – Contemporaneous “Split”
(Bifurcated Contemporaneous Period)
• Applicable on complicated projects
• Uses contemporaneous updates as new baselines
• If done monthly, then it could be called a “Windows” analysis
• Handles many problems like concurrency well
• The “split” separates Logic-type changes from Actual Progress
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

15. • 3.4. Dynamic – Contemporaneous “Split” (Bifurcated CPA)
Continued next slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

16. • 3.4. Dynamic – Contemporaneous “Split” (Bifurcated CPA)
Continued from
previous slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

17. • 3.4. Dynamic – Contemporaneous “Split” (Bifurcated CPA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

18. • 3.5. Dynamic – Contemporaneous “Recreated”
(Contemporaneous Period Analysis)
• Applicable on complicated projects
• Uses RECREATED updates as new baselines
• If done monthly, then it might be called a “Windows” analysis
• Handles many problems like concurrency well
• However – virtually all of the baselines are created by the
analyst
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

19. • 3.5. Dynamic – Contemporaneous “Recreated” (Recreated CPA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

20. • 3.5. Dynamic – Contemporaneous “Recreated” (Recreated CPA)
Continued next slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

21. • 3.5. Dynamic – Contemporaneous “Recreated” (Recreated CPA)
Continued from
previous slide
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

22. • Modeled
• 3.6 Additive – Single Base (Impacted as-planned)
• 3.7 Additive – Multiple Base (Retrospective TIA)
• 3.8 Subtractive – Single Simulation (Collapsed as-built)
• 3.9 Subtractive – Multiple Simulation
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

23. • 3.6 Additive – Single Base (Impacted As-Planned)
• Accuracy very dependent on inclusiveness of fragnets and
accuracy of as-planned schedule.
• Also dependent on changes in Critical Path from As-Planned
• Easy to understand
• Can be purely hypothetical, generally does not prevail in
litigation
• Concurrency not addressed
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

24. • 3.6 Additive – Single Base (Impacted As-Planned)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

25. • 3.6 Additive – Single Base (Impacted As-Planned)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

26. • 3.7 Additive – Multiple Base (Retrospective TIA)
• Accuracy dependent on inclusiveness of fragnets and accuracy of
updates – however more likely to include both owner and
contractor issues
• Easy to understand
• No as-built required (although still useful)
• Updates useful if used (failure to correlate creates problem)
• Associated with actual events
• Concurrency easily addressed by a two step process
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

27. • 3.7 Additive – Multiple Base (Retrospective TIA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

28. • 3.7 Additive – Multiple Base (Retrospective TIA)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

29. • 3.8 Subtractive – Single Simulation (Collapsed As-
Built)
• Accuracy dependent on creation of after the fact logic
• Easy to understand
• Uses actual events
• Can be viewed as hypothetical
• Critical path can be difficult to identify
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

30. • 3.8 Subtractive – Single Simulation (Collapsed As-Built)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

31. • 3.8 Subtractive – Single Simulation (Collapsed As-Built)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

32. • 3.9 Subtractive – Multiple Simulation
• Only known practitioner – Long International?
• Accuracy still dependent on creation of after the fact logic
• Uses actual Events
• Can be viewed as hypothetical
• Critical path can be difficult to identify
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

33. • 3.1 Static – Gross (As-Planned v. As-Built, Single Base)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

34. • 3.1 Static – Gross (As-Planned v. As-Built, Single Base)
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

35. Forensic Use of METHOD
Analysis 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8
Non-Compensable
OK OK OK OK OK OK OK OK
Time Extension
Compensable Delay OK OK OK OK OK OK
Right to Finish Early
OK
Compensable Delay
Entitlement to Early
OK OK OK OK OK OK OK OK
Completion Bonus
Disruption Without
OK OK OK OK OK OK OK
Project Delay
Constructive
OK OK OK
Acceleration
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

36. AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

37. AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

38. •
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

39. •
• Must allow the source data to bear on the selection process
• Cannot predetermine a technique based on personal preference
• Balance client needs, budget, and time with sound analysis
philosophy
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

40. • Observational?
• Count
• Modeled?
• Count
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

41. • Observational • Observational
• 3.1 Static – Gross • Count
• 3.2 Static - Periodic • Count
• 3.3 Dynamic – Contemporaneous “as-is” • Count
• 3.4 Dynamic – Contemporaneous “Split” • Count
• 3.5 Dynamic – Contemporaneous • Count
“Recreated”
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis

42. • Modeled • Modeled
• 3.6 Additive – Single Base • Count
• 3.7 Additive – Multiple Base • Count
• 3.8 Subtractive – Single Simulation • Count
• 3.9 Subtractive – Multiple Simulation • Count
AACE International Recommended Practice No. 29R03,
Forensic Schedule Analysis