Ability grouping, which has long been a controversial subject in American education (Slavin, 1987a), is commonly used for reading instruction in American schools (Au and Mason, 1985; Hiebert, 1983). Classroom teachers often discuss the topic of ability grouping, and at times, the conversations become arguments. There are often three positions taken in these discussions.
Young, T. A. (1990). Alternatives to Ability Grouping in Reading. Reading Horizons, 30 (3). Retrieved from http://scholarworks.wmich.edu/reading_horizons/vol30/iss3/1