Program evaluation designs: methodological issues.

Program evaluation designs: methodological issues. Unstable circumstances o f program evaluation contexts make impossible a systematization of program evaluation designs. The main objective of this paper is to describe the str uctural dimensions of program evaluation designs in order to implement them in a flexible way in different evaluation contexts. These dimensions will try to enhance scientific validity in evaluative data, not offering the con ception of standard design structures for evaluations. The structural dimen sions are: clients of the program, type of data, and recording moments. The combination bf these dimensions will justify, different evaluative designs .