Since 1988, the Achievement Formula/TRIVET project has enabled researchers at Kent (Ohio) State University to collaborate with a large urban school district to assess, predict, monitor, and improve student achievement. The achievement portion of the project involves collecting and analyzing data on student performance and various contextual factors that may impact student and teacher behaviors (e.g., student attendance and attitude, building climate, and instructional leadership by the building principal). From these data, building and classroom profiles are developed to help the district identify targets for intervention. The TRIVET portion of the project is a staff development program for teachers and building administrators to collaboratively improve classroom instruction. Through workshops and follow-up classroom observations, participants analyze how teaching behaviors affect students. To date, the project has involved 16 buildings, almost 6,000 students, and 220 staff members. The most promising results among target populations are gains in student achievement, attitude, and attendance; improved perceptions among students and staff about building climate; greater confidence among teachers in the instructional leadership of the building principal; and dramatic improvements in teachers' willingness to change classroom practices and work collaboratively with fellow staff members to improve students' achievement and attitudes. Included are 46 references and 8 tables. (Author/RLC)