March 29, 1972: Parents of black students bring class-action suit against Prince George's County public schools in U.S. District Court, contending that the county did not meet constitutional standards for school desegregation.

Dec. 29, 1972: U.S. District Court Judge Frank A. Kaufman orders implementation of a desegregataion plan to be accomplished primarily by student busing.

Nov. 27, 1974: Kaufman provisionally relinquishes jurisdiction over the case, pending further requests to reopen the suit.

Sept. 1, 1981: Plaintiffs request that case be reopened, alleging that the county still maintains a segregated system.

Sept. 28, 1981: Kaufman grants motion to reopen case.

Sept. 30, 1981: Kaufman issues new desegregation order, establishing guidelines that no school shall have black enrollment of less than 10 percent or more than 80 percent.

October 1983: Board of Education votes to appeal Kaufman's order.

May 14, 1984: Board submits to Kaufman a proposal to close 22 schools over two years.

Aug. 17, 1984: Kaufman appoints five-member expert panel headed by Robert L. Green to recommend desegregation plan.

Jan. 9, 1985: Board appeal of Kaufman's 1983 order is heard before U.S. Court of Appeals for the Fourth Circuit.

March 11, 1985: Final Green report is issued.

March 29, 1985: Appeals panel rejects major portion of board's appeal, remanding part of decision back to Kaufman.

May 13, 1985: Board submits to Kaufman a proposal to create 30 magnet schools over five years.

May 31, 1985: NAACP endorses magnet school concept but asks for nine specific changes to plan.

June 7, 1985: Kaufman clears way for magnet program to begin in the fall.