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optimistic-likely-pessimistic estimation comparison table
Subject is a kind of has definition
cost estimationprocessThe process of estimating the effort and elapsed time of an activity or project
optimistic-likely-pessimistic estimationcost estimationAn approach to cost estimation in which you make three estimates for each task and for the project as a whole: An optimistic estimate, (in which everything goes well) the likely estimate and a pessimistic estimate (where you account for everything that could go wrong)

Upcost estimation