Mastery learning techniques were improved through mathematics instruction based on a validated learning hierarchy, presenting tasks in a sequence consistent with the requirements of the hierarchy, and requiring learners to demonstrate achievement before being allowed to proceed. (Author/GDC)

This paper presents a scheme for classifying learning tasks, a scale built from that scheme, and data obtained from utilizing the scale with secondary students in various subject areas. (Author/SJL)

The number of video examples of a concept and the dispersion of the examples were studied as variables affecting concept learning by 50 Dutch 12-year-old and 14-year-old secondary students. Although the number had no effect, broadly dispersed examples improved posttest classification ability. Implications for concept teaching are discussed. (SLD)