Feasibility, impact and appraisal are all steps in the process of establishing whether a project or policy is likely to be deliverable, effective and value for money. Evaluation establishes whether a project or policy has achieved what it set out to do, and provides the basis for improving projects and their delivery and policy and its practice.
Feasibility establishes whether new policy initiatives or projects are practicable.
Appraisal predicts the likely impacts and costs, weighing the merits of alternative approaches and selecting the best course of action.
Mid term and final evaluation consider actual impacts and costs, comparing them with earlier expectations to how far the chosen course of action has proved effect and to draw lessons for the future.
