Estimating is the process of forecasting or approximating the time and cost of completing project deliverables. Management will often derive estimates from analogy, group consensus, or mathematical relationships. Bottom-up estimates are typically performed by the people who are doing the work. Their estimates are based on estimates of elements found in the work breakdown structure.

a. Elaborate factors that will influencing the quality of estimates

b. Propose the important guideline for a manager can follow to develop useful work package estimates.

c. Discuss the feasibility and viability of the project to help in evaluating the sustainability and success of a project.