Traditional measures of teachers' competency have been widely criticized for their lack of authenticity and predictive validity. There is little evidence regarding the technical soundness of traditional teacher licensure tests and little research documenting the validity of such tests for identifying competent teachers or effective teaching.…

Mathematics teaching and learning are inherently complex practices, and reports suggest that American teachers are not as successful at teaching mathematics as the authors might hope. In this article, the authors explore how a seemingly ubiquitous new technology--the personal audio/video player--just might help teachers improve mathematics…