Evaluation-is the collection and analysis of information by various methodological strategies to determine the relevance, progress, efficiency, effectiveness, and impact of programs activities.

Evaluation research-is a more rigorous effort than evaluation because involves the scientific methodology.

Assessment-commonly interchanged with evaluation, assessment is a more limited process with a more specific purpose.  It could be part of the evaluation.

Needs assessment-the first stage in program implementation.  Is the process of determining the nature and extent of the problems that a program is designed to address.