The study of a program, project, or instructional material in settings like those where it is to be used. Field tests may range from preliminary primitive investigations to full-scale summative studies.
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.