This document reports on the Chicago public high school improvement plans for the 1990-91 school year submitted during the summer of 1990 in response to the Chicago Public Schools Reform Act of 1988 (PA85-1418). Following background information on Chicago's public high schools, the purpose of PA85-1418 is explained as well as improvement plan funding and review format. The 20 required goals in the improvement plans are categorized and explored under 5 topics: (1) academic goals; (2) student self-discipline and motivation goals; (3) high school transition goals; (4) teacher professionalism; and (5) parent and community involvement goals. The percentages of schools addressing each goal are included, and the various methods used to address each goal are mentioned. The impact of the first year of the plans on high school students' learning is discussed, with emphasis on social influences, political influences, and changing educational practices. Last, the implications of the school improvement planning process are explored. Appended are a review form for the 1990-91 improvement plans; goals for the school improvement plan; a budget worksheet; a flow chart of the systemwide planning process; and a suggested timeline. (21 references) (CLA)