In a study designed to determine the impact of state curriculum initiatives on curriculum framework, student assessment, and textbook adoption in the science curriculum, researchers interviewed state education agency staff, completed four case studies in four districts, and surveyed 100 school districts at random in each of the three diverse states sampled. Following a detailed summary of document contents, this document uses the survey results to identify and describe the impacts of state initiatives on science curricula. The development, design and specificity, and dissemination of state curriculum frameworks are discussed and state assessment programs are examined in terms of content alignment, scoring metrics, sampling items, teaching to the test, item content, and investigative instruction. State textbook adoption policies are discussed in terms of curriculum and framework alignment, resources for textbook training and selection, and adoption incentives and five strategies related to curriculum change implementation and technical assistance are described. State initiatives are shown to have either neutral or positive impacts on science curricula. A final section discusses the implications of study results for state policy. (4 references) (CLA)