This paper describes outcomes from a project conducted at a small US university where 23 secondary school mathematics teachers participated in the study. Based on sketches created in a dynamic geometry software (DGS) and written responses to an assignment related to developing the trapezoid area formula, we explored how teachers used DGS when…

Students learning a defined subject only perform by learning of thinking based on the concepts forming that subjects. Otherwise, students may move away from the scientific meaning of concepts and may fall into conceptual errors. Students' conceptual errors affect their following learning and cause them resist change. It is possible to prevent this…

Discussion of the development of educational software for reading instruction focuses on seven misconceptions that reflect a misunderstanding of the reading process and a misapplication of the principles of instructional design to the teaching of reading. Highlights include electronic text versus printed text; sound-symbol correspondence;…