This report on sex equity in mathematics and science education focuses primarily on the situation in Washington State schools. The report is divided into eight sections. Section I explains why the problem is an equity issue: Despite progress in other areas, girls continue to lag behind boys in enrollment and achievement in mathematics and science courses, an indication that biases remain. Section II reviews research in this area and observes that, while girls' interest in mathematics declines as they advance in schools, there is much evidence suggesting that this decline is due to purely environmental factors. Section III provides statistical data on Washington students; girls and boys exhibit equivalent achievement in elementary grades, but questions of equity arise in relation to minority and female enrollments in mathematics and science courses at the secondary level. Section IV presents a form for the use of educators and school administrators in assessing the extent of the problem in their institutions. Section V outlines strategies for change. Section VI summarizes the implications for educators considering intervention efforts. Useful resources are listed in Section VII, and worksheets for district use are provided in Section VIII. (KH)