The National Assessment of Educational Progress (NAEP) is a congressionally mandated statistical survey of educational achievement of U.S. students in a variety of curriculum areas and of changes in that achievement over time. The National Assessment Governing Board (NAGB) established new standards for reporting the results that resulted in three achievement levels: basic, proficient, and advanced. This book of the Initial Performance Standards for the 1990 NAEP Mathematics Assessment, reports the results on 61 Grade 8 items released to the public for the state of Iowa. The book is organized in four sections. Section 1 reports the percentages of students in Iowa at or above each achievement level, and compares these results to the regional and national percentages. The Iowa results are also tabulated by gender, race/ethnicity, type of community, and parents' education. Section 2 gives information on how to read the tables in the subsequent sections and definitions are provided to assist readers in the interpretation of these data. Sections 3 and 4 provide the Iowa, Regional, and National results for Grade 8 released items. (MDH)