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Monte Carlo Simulation –
Black Art or
Misunderstood Child?
6th June 2017
www.apm.org.uk/scotland
Agenda
▪ Monte Carlo Simulation Presentation
▪ Overview of APM’s Risk Management certifications
Monte Carlo Simulation – Black Art or
Misunderstood Child?
Dr Keith Eagles
Principal
Decision & Risk Consulting
How MC Works - The Supermarket Run
• Bread @ £1.83
• Milk @ £1.67
• Bag of Apples @ £2.30
• ~500g Cheese @ £3.84
• Newspaper @ £1.30
• Total @ £10.94
• How much will I spend
today??
• £1.70 - £2.20
• £1.55 - £1.80
• £2.10 - £2.80
• £3.50 - £4.50
• £1.30
3 Major Factors to Consider
• Central Limit Theorem
My Project - Risk Profile
• £1,000k project with -20% to +50% risk profile
• 2 off £500k cost elements, each with -20% to + 50% risk
profile
• 10 off £100k cost elements, each with –20% to + 50% risk
profile
Base
Estimate
Full Monte Carlo
Average of the Sum Monte Carlo
AACE RP 18R-97 Estimate Classification
Estimate
Class
Level of
Project
Definition
Purpose of
Estimate
Typical
Estimating
Method
Expected Accuracy
Range
Class 5 0% to 2% Concept Screening Judgement, analogy,
parametric models,
capacity factored
L: -20% to – 50%
H: +30% to + 100%
Class 4 1% to 15% Study or Feasibility Primarily stochastic L: -15% to -30%
H: +20% to +50%
Class 3 10% to 40% Budget Authorisation Mixed, but primarily
stochastic
L: -10% to -20%
H: +10% to +30%
Class 2 30% to 70% Control or Bid/Tender Primarily deterministic L: -5% to – 15%
H: +5% to +20%
Class 1 50% to 100% Check Estimate / EFC Deterministic L: -3% to -10%
H: +3% to +15%
3 Major Factors to Consider
• Central Limit Theorem
• The Uncertainty Distribution and 3-Point Estimates
3 Major Factors to Consider
• Central Limit Theorem
• The Uncertainty Distribution and 3-Point Estimates
• Rose Tinted Spectacles – judgement bias
10080 200
Base Estimate/
Most Likely P50
P10
P90
Probability
117
Conclusions
• MC is a powerful simulation methodology
• It could/should be more widely used to allow PMs to make
more informed decisions about their projects, but lacks
credibility in the eyes of many = ‘black art’
• Many ‘analysts’ remain blissfully unaware of the statistical
idiosyncrasies of MC and the impact of psychological bias
that lead to non-credible results = ‘misunderstood child’
• Risk analysis is a completely different skill set to cost
estimating and planning/scheduling
• A scalpel in the hands of a butcher does not make them a
heart surgeon
• BECOME A HEART SURGEON
APM Risk Qualifications
APM Project Risk Management Single
Subject Certificate
▪ The APM Project Risk Management
Single Subject Certificate is a
qualification which has two levels. It is
designed to build on the knowledge
gained in the APM Project Management
Qualification (PMQ/APMP) or similar
project management qualifications.
APM Project Risk Management Single
Subject Certificate
▪ Who is it for?
– Level 1 determines the candidate’s knowledge of
the subject, sufficient to allow them to contribute
to risk management within a project.
– Level 2 determines the candidate’s knowledge,
understanding and capability in the subject,
sufficient to allow them to undertake formal
project risk management.
APM Project Risk Management Single
Subject Certificate
▪ How is it assessed?
– Level 1 is a 60-question multiple choice
examination that lasts for 1 hour.
– Level 2 is a 3 hour and 15 minute written
examination, answering three questions, one
compulsory and two from four optional questions.
Monte Carlo Simulation - Black Art or Misunderstood Child?

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Monte Carlo Simulation - Black Art or Misunderstood Child?

  • 1. Monte Carlo Simulation – Black Art or Misunderstood Child? 6th June 2017 www.apm.org.uk/scotland
  • 2. Agenda ▪ Monte Carlo Simulation Presentation ▪ Overview of APM’s Risk Management certifications
  • 3. Monte Carlo Simulation – Black Art or Misunderstood Child? Dr Keith Eagles Principal Decision & Risk Consulting
  • 4. How MC Works - The Supermarket Run • Bread @ £1.83 • Milk @ £1.67 • Bag of Apples @ £2.30 • ~500g Cheese @ £3.84 • Newspaper @ £1.30 • Total @ £10.94 • How much will I spend today?? • £1.70 - £2.20 • £1.55 - £1.80 • £2.10 - £2.80 • £3.50 - £4.50 • £1.30
  • 5.
  • 6.
  • 7. 3 Major Factors to Consider • Central Limit Theorem
  • 8. My Project - Risk Profile • £1,000k project with -20% to +50% risk profile • 2 off £500k cost elements, each with -20% to + 50% risk profile • 10 off £100k cost elements, each with –20% to + 50% risk profile
  • 10.
  • 11.
  • 12.
  • 14. Average of the Sum Monte Carlo
  • 15. AACE RP 18R-97 Estimate Classification Estimate Class Level of Project Definition Purpose of Estimate Typical Estimating Method Expected Accuracy Range Class 5 0% to 2% Concept Screening Judgement, analogy, parametric models, capacity factored L: -20% to – 50% H: +30% to + 100% Class 4 1% to 15% Study or Feasibility Primarily stochastic L: -15% to -30% H: +20% to +50% Class 3 10% to 40% Budget Authorisation Mixed, but primarily stochastic L: -10% to -20% H: +10% to +30% Class 2 30% to 70% Control or Bid/Tender Primarily deterministic L: -5% to – 15% H: +5% to +20% Class 1 50% to 100% Check Estimate / EFC Deterministic L: -3% to -10% H: +3% to +15%
  • 16.
  • 17.
  • 18. 3 Major Factors to Consider • Central Limit Theorem • The Uncertainty Distribution and 3-Point Estimates
  • 19.
  • 20.
  • 21. 3 Major Factors to Consider • Central Limit Theorem • The Uncertainty Distribution and 3-Point Estimates • Rose Tinted Spectacles – judgement bias
  • 22. 10080 200 Base Estimate/ Most Likely P50 P10 P90 Probability 117
  • 23. Conclusions • MC is a powerful simulation methodology • It could/should be more widely used to allow PMs to make more informed decisions about their projects, but lacks credibility in the eyes of many = ‘black art’ • Many ‘analysts’ remain blissfully unaware of the statistical idiosyncrasies of MC and the impact of psychological bias that lead to non-credible results = ‘misunderstood child’ • Risk analysis is a completely different skill set to cost estimating and planning/scheduling • A scalpel in the hands of a butcher does not make them a heart surgeon • BECOME A HEART SURGEON
  • 25. APM Project Risk Management Single Subject Certificate ▪ The APM Project Risk Management Single Subject Certificate is a qualification which has two levels. It is designed to build on the knowledge gained in the APM Project Management Qualification (PMQ/APMP) or similar project management qualifications.
  • 26. APM Project Risk Management Single Subject Certificate ▪ Who is it for? – Level 1 determines the candidate’s knowledge of the subject, sufficient to allow them to contribute to risk management within a project. – Level 2 determines the candidate’s knowledge, understanding and capability in the subject, sufficient to allow them to undertake formal project risk management.
  • 27. APM Project Risk Management Single Subject Certificate ▪ How is it assessed? – Level 1 is a 60-question multiple choice examination that lasts for 1 hour. – Level 2 is a 3 hour and 15 minute written examination, answering three questions, one compulsory and two from four optional questions.