Comparative Experimental Studies
Comparative experimental studies are ones that assign a program, project, or instructional material to one group of persons and compare their subsequent performance on some structured task to that of another group that was not exposed to the program, project, or instructional material.
Yarbrough, D. B., Shulha, L. M., Hopson, R. K., and Caruthers, F. A. (2011). The program evaluation standards: A guide for evaluators and evaluation users (3rd ed.). Thousand Oaks, CA: Sage.