Abstract
Program evaluation designs: methodological issues. Unstable circumstances of program evaluation contexts make impossible a systematization of program evaluation designs. The main objective of this paper is to describe the structural 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 conception of standard design structures for evaluations. The structural dimensions are: clients of the program, type of data, and recording moments. The combination of these dimensions will justify different evaluative designs.
