The School District Data Book (SDDB) of the National Center for Education Statistics contains data on local education agencies that make it possible to compare data aggregated at district, county, state, and national levels on hundreds of variables. The development of the SDDB has provided an efficient and powerful tool for use in planning and assessment in the Tucson (Arizona) Unified School District #1 (TUSD). TUSD is the largest district in southern Arizona, serving 60,525 students in an approximately 227 square mile area. Profiles of student results are one of the primary sources of data used in the TUSD. Student, school, and district profiles are compared with state and national results. Using SDDB data, an example analysis was performed to identify the relationships among various socioeconomic conditions, school characteristics, and academic performance. Results of a factor analysis indicated the need for at least two explanatory variables (i.e., socioeconomic status and a school environment variable). The District has found other software useful in conjunction with SDDB data, and expects to use this approach for other planning and evaluation activities. Appendixes present the district profile, SDDB profiles in three tables, and a SDDB map of Arizona by county for children below the poverty level. (SLD)