... evaluate system concept for feasibility, perform economic and technical analysis, perform cost benefit analysis and create system definition that forms the foundation for all subsequent engineering ... computed using the following formula.where,EV stand for the estimation variable.Sopt stand for the optimistic estimate.Sm stands for the most likely estimate.Spess stand for the pessimistic estimate.It ... have a value for it, a value must be known for each entity occurrence. When it's optional, we could have a value for it, a value may be known for each entity occurrence. For example, there...