Evaluating the program effects of a radio drama about AIDS in Zambia.

This study describes an approach to the analysis of data that is designed to isolate program effects for evaluations and applies that approach to a program in Zambia designed to disseminate AIDS information. Evidence is considered that a radio drama broadcast for nine months had an impact on knowledge and behavior related to AIDS among Bemba speakers in northern Zambia. Using results from large sample surveys (1,600 men and women), conducted before and after the drama was broadcast, the analyses compare changes in knowledge and behavior in those most likely and least likely to have listened to the broadcast. While the population as a whole had improved its knowledge substantially, and some people reported having reduced risky behavior, attributing these changes to the program itself was not possible.