Evaluations that assess the merit or worth of content-related physical items, including books, curricular guides, films, tapes, and other tangible instructional products.
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.