The systematic assessment of the relevance, adequacy, progress, efficiency, effectiveness and impact of a procedure.
It is relevant if it answers the needs and the policies and priorities it has been designed to meet; it is adequate if it meets its requirements; it makes progress if its activities are being carried out in accordance with a planned schedule; it is efficient if it uses the resources devoted to it in the best possible way; it is effective if the results obtained are in accordance with the objectives and targets for reducing the dimensions of a problem or for improving an unsatisfactory situation - its impact is the overall effect on people and the environment.
Evaluation is the process of judging something or someone based on a set of standards.
In clinical medicine, assessment of the patient for the purposes of forming a diagnosis and plan of treatment.
In research, assessment of a treatment or diagnostic test through experiment and measurement.