The purpose of this study was to compare the effectiveness and efficiency of two teaching models, the expository presentation of Merrill and Tennyson's model and Gagne's model, in acquisition and maintenance of square and triangle concepts in students with mental retardation. The participants of the study were chosen from students with mental…

This study is part of a larger ongoing project. In this project, the documents (video recordings and transcripts) which were collected by the recording of history lessons that were taught in different countries, have been analyzed in order to identify ways in which children are involved in historical enquiry rather than didactic teaching, as a…