During the last quarter of a century, it became abundantly clear that the desired reforms in science teaching and learning could not be accomplished without significant professional development of in-service science teachers. Yet, there was a dearth of effective professional development models that could lead to the kind of instructional reforms…

Describes the Alternative Strategies and Services for Improving Science Teaching program of Iowa (Iowa-ASSIST). It represents a major effort for inservice education and science curriculum implementation in Iowa schools. The functioning model and the outcomes of the program are also discussed. (HM)

Describes efforts in the reform of science education, noting the importance of changing preservice and in-service teacher education. The article examines three national systemic reform efforts and discusses implementation efforts in Iowa. It also discusses Iowa's teacher preparation and offers assessment information arising from Iowa's efforts.…