How many different estimating techniques were discussed in the case?
In this case study there are 3 different project estimating techniques. Those are analogous, three-point, triangular distribution estimates.
Analogous Estimation: In this technique, project duration, scope of the project, project budget, project cost parameters are used in the estimation.
Three-Point Estimation: In this technique 3 estimates such as best guess (BG), optimistic (O), pessimistic (P) are required to estimate.
Triangular Estimate: This technique is the average of best guess, optimistic and pessimistic
2)If each estimate is different, how does a project manager decide that one estimate is better than other?
Project manager will choose the estimation technique based on the project scope, project cost and duration of the project based on the previous experience. Analogous estimation depending on the previous project historical data which can be used for future projects. In some cases, project manager will provide the work break down structure to the team members where they can help in creating the estimates. In cases like no previous project manager experience which means no historical data in those cases asking team members for multiple estimates for each task this can help in getting the idea of good breaks and bad breaks which comes under 3-point estimation.
3)If you are project manager, which estimate would you use?
If I am the project manager I will use the three-point estimation because I never done project tasks before. Because of no historical data form previous projects I will depend on the team members for their estimates and their opinion for the tasks provided
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