Columbia subject headings:
Evaluation research (Social action programs)
Evaluation research (Social action programs)--United States.
Social sciences--Methodology.
Harvard subject headings:
Evaluation research (Social action programs)
Evaluation research (Social action programs)--United States
Social sciences--Methodology
Princeton subject headings:
Evaluation research (Social action programs)
Evaluation research (Social action programs)--United States.
Social sciences--Methodology.