Davidson, E. J. (2000). Ascertaining causality in theory-based evaluation. In P. J. Rogers, T. A. Hacsi, A. Petrosino, & T. A. Huebner (Eds.), Program theory in evaluation: Challenges and opportunities (New Directions for Evaluation, 87, pp. 17-26). San Francisco: Jossey-Bass.
2.
Scriven, M. (1991). Evaluation thesaurus. Newbury Park, CA: Sage.