This annual report shows student transiency and stability rates for the 1989-90 school year in the Los Angeles Unified School District (LAUSD). Transiency refers to the number of students who enter and leave a school during the year, expressed as a percentage. Stability refers to the number of students who remained in a school all year, expressed as a percentage of the starting enrollment. The formula for computing transiency and stability rates for 1987-88, 1988-89, and 1989-90 includes all interstate transfers, whereas earlier reports do not; therefore, the rates for those three years are comparable with each other, but not with the rates reported in previous years. Information was gathered for all regular, magnet, and special education schools. Rankings were computed for each group, with a summary for the district. The following findings are presented: (1) schools of choice (magnet schools and centers) had the highest stability and the lowest transiency rates; (2) regular senior high school students were more transient and less stable than the average LAUSD student; and (3) compared to the previous year, district stability and transiency remained fairly stable. Statistical data are presented in ten tables. (FMW)