methods for studying programs and policies Weiss, Carol H. creator text Upper Saddle River, N.J Prentice Hall 1998 monographic xii, 372 p. ; 23 cm. Rev. ed. of: Evaluation research. 1972. Evaluation research (Social action programs) Evaluation purpose Evaluation planning Collecting data Randomized experiment Planned variations Elevator role IIMC 001.433 WEI 0133097250 (pbk)