Although there are many types of study guides, the theoretical assumptions underlying them are the same. They are structures designed to improve reading comprehension (Armstrong, Patberg and Dewitz, 1988).
Maxworthy, A. G. (1993). Do Study Guides Improve Text Comprehension?. Reading Horizons, 34 (2). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol34/iss2/4