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.…

This study explores difficulties that prospective elementary mathematics teachers have with the concepts of ratio and proportion, mainly when they are engaged in solving problems using algorithm procedures. These difficulties can be traced back to earlier experiences when they were students of junior and high school. The reflection on these…

We study the effects of various types of education and training on the ability of teachers to promote student achievement. Previous studies on the subject have been hampered by inadequate measures of teacher training and difficulties addressing the non-random selection of teachers to students and of teachers to training. We address these issues by…