This report presents elementary school test trend data for the Chicago Public Schools (CPS), Illinois for 2000 for the Iowa Tests of Basic Skills (ITBS). In spring 2000, ITBS trend data show that mathematics test scores in the CPS elementary schools continue their long-term improvements for all age levels. Positive trends in ITBS reading scores continued for older students (aged 13 and 14), but the earlier rising trends for students aged 9 through 12 appear to have flattened out. Actual declines in reading test scores were apparent at some age levels (ages 9 and 12) in the grade equivalent metric. Productivity gains appear to have peaked in 1997 and have not improved since then. Unless a new cycle of productivity advance occurs, the flattening annual test score trends will probably continue. There was no evidence that the gap between racial/ethnic groups has narrowed or widened. There have been some changes in reporting and testing practices in the CPS; these are described. (SLD)