This paper describes an attempt at evaluating a potentially critical "detail" of teaching practice; that is, using a particular diagram to illustrate the imaging role of a converging lens. This "basic" diagram has been designed to contribute to help students overcome the well-known "travelling image" syndrome. We conducted a comparative study with…

An increasing amount of research attention is being directed toward the educational experiences of students with profound and multiple disabilities. One technique that has allowed a better understanding of alertness and involvement in members of this population is behavior state assessment. In this study, eight matched pairs of school-aged…