10.2 Qualitative and quantitative approaches (Continued) - Figure 10.2 Probability impact chart
10.2 Qualitative and quantitative approaches (Continued) - Failure mode effect analysis (FMEA)
- Consider three elements of each activity or path through the activities:
- Likelihood, severity and hideability
- Estimate each on a scale of 1–10
- Total risk is product of all three: likelihood × severity × hideability
10.2 Qualitative and quantitative approaches (Continued) - Quantitative approaches
- Mathematical models of the scenario
- Enables a large number of variables to be considered
- Useful guides for decision making
- Four models shown:
- 1. Expected Value
- The expected value of the event
- Useful for comparing several projects or alternatives
- Percent chance (probability) can be estimated or calculated using Monte Carlo analysis.
| | - Probability of occurrence
| | | | | | | | | | 10.2 Qualitative and quantitative approaches (Continued) - 2. Sensitivity analysis
- Use expected, optimistic and pessimistic value of inputs (e.g. costs)
- Shows effect on the outcome of a change in the variable
- Shows where management attention and control is needed
- Example
- Prices on materials and labour likely to fluctuate
- Contract price is fixed in advance
- Need to see effect of fluctuations on profit
- Costs of materials say £0.6m
- Costs of direct labour say £0.2m
- Contribution to say 175 percent of direct labour
- Revenues: fixed at £1.2m
- Profit = revenue – material costs – (labour + overheads)
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