The pattern toward an increase in the number of states using some form of competency testing prior to the certification of educators is substantiated in this paper. Competency testing programs are implemented at three distinct levels: (1) before entrance into a teacher education program near the end of the sophomore year in college; (2) at the end of teacher education near the end of the senior year in college or during the first year of teaching; or, (3) for certification renewal as mandated by the state. The paper includes an update on the teacher certification testing activities across the United States as well as a discussion of some of the issues and concerns associated with such programs. While certification testing appears to offer a solution to certain problems and issues related to quality control and selection, it also raises a series of new problems and issues which should be addressed by states which are considering the development and implementation of competency testing for certification. (Author/DWH)