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Evaluation can be formative, that is taking place during the development of a concept or proposal, project or organization, with the intention of improving the value or effectiveness of the proposal, project, or organisation. It can also be summative, drawing lessons from a completed action or project or an organisation at a later point in time or circumstance.
Evaluation is inherently a theoretically informed approach (whether explicitly or not), and consequently any particular definition of evaluation would have been tailored to its context – the theory, needs, purpose, and methodology of the evaluation process itself. Having said this, evaluation has been defined as:
A systematic, rigorous, and meticulous application of scientific methods to assess the design, implementation, improvement, or outcomes of a program. It is a resource-intensive process, frequently requiring resources, such as, evaluate expertise, labor, time, and a sizable budget[4]
"The critical assessment, in as objective a manner as possible, of the degree to which a service or its component parts fulfills stated goals" (St Leger and Wordsworth-Bell).[5][failed verification] The focus of this definition is on attaining objective knowledge, and scientifically or quantitatively measuring predetermined and external concepts
"A study designed to assist some audience to assess an object's merit and worth" (Stufflebeam).[5][failed verification] In this definition the focus is on facts as well as value laden judgments of the programs outcomes and worth.
