Which of the following is not a common type of program evaluation?

Descriptive evaluation is not typically classified as a common type of program evaluation. The primary types of program evaluations are formative, summative, and developmental.

Formative evaluation focuses on the process of program implementation, allowing for adjustments and improvements while the program is still being developed or underway. This type of evaluation is aimed at understanding the effects of various components of a program and ensuring it is being implemented effectively.

Summative evaluation assesses the outcomes and impacts of a program after it has been implemented. This evaluation seeks to determine the overall effectiveness and results of the program, often providing data that can inform decisions about continuation, scaling, or replication.

Developmental evaluation, on the other hand, is a relatively newer approach that is used in complex, adaptive environments. It is aimed at supporting ongoing program development by providing real-time feedback and learning opportunities.

Descriptive evaluation, while it may involve gathering data and reporting findings, does not specifically fall into the major categories that guide the assessment and improvement of program effectiveness. Thus, choosing descriptive evaluation as the answer reflects an understanding that not all forms of evaluation play a central role in program evaluation as commonly defined in practice and literature.