CAPM Practice: Explain when it is appropriate to use a predictive, plan-based approach

In predictive projects, uncertainty is highest at the beginning (initiation) when little is known about the project. As planning proceeds and work is completed, uncertainty decreases — this is represented by the 'cone of uncertainty.' Risk decreases as knowledge increases, which is why early planning and risk management are so important.

**Why not A:** Execution involves the most work being performed, but uncertainty is lower during execution because planning has already clarified requirements, scope, and approach. Risk decreases as work is completed and knowledge increases throughout the project.

**Why not B:** At closeout, most uncertainty has been resolved through completed work. Deliverable handover involves known products, and the remaining risks are minimal compared to earlier phases when fundamental assumptions were still unvalidated.

**Why not D:** Monitoring is not a separate phase where uncertainty peaks. During monitoring and controlling, performance data is being reviewed against baselines, and the project team has substantial knowledge about the project. Uncertainty is considerably lower than at initiation.