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This paper revielos five broad types of research that are designed to determine whether or how teacher education has made a difference to teachers. The five genres consist of: (1) a line of reasoning about where one might look for the effects of teacher education and how one might design a research study to see the impact of teacher education; (2) comparison studies in which teachers who have received formal teaching credentials a.-e contrasted with teachers who have not; (3) studies in which researchers ask teachers what they have learned from tLacher-educaticm programs; (4) experimental studies in which different approaches to teacher education are compared; and (5) longitudinal case studies in which teachers a:e followed over time to see how their thinking changes sa., they participate in teacher education. In this review, three questions are asked of each genre: What aspects of teacher education does it examine? What outcomes does it look for? and What kind of reasorling does it use to develop a link between these aspects of teacher education and these outcomes? Suggestions are offered for researchers on ways to strengthen their research designs. (Author/LL) ****************************t****************************************** Reproductions supplied by EDRS are the best that can De made from the original document. ***************************A******************************************* ipri,..4.1.4?0,, ".1;:. 'me ationa