Files attached below (in order) are "The Principal's Impact on a Middle School's Success" (main slides from the presentation); "Focus on Leadership, Climate, Culture and Instructional Practices: Practical Strategies for School Improvement" (slides as additional resources); "Missouri Middle Level Study Instruments, Factors/Scales, Items, and Response Options" (handout); a review of related literature by Goodman; a review of related literature by Klinginsmith; a review of related literature by Matthews; a review of related literature by Mees; a review of related literature by Solomon; Survey Form A; Survey Form B; Survey Form C; Survey Form D; Survey Form E; and "Trust in Educational Settings" (slides as additional resources).Further information about the survey may be found at http://education.missouri.edu/orgs/mllc/6_surveys.phpPresented at the National Association of Secondary School Principals, Annual Convention, San Antonio, February 2008.This comprehensive, state-wide, and two-year study of 224 of the 325 middle level schools across the state of Missouri is the largest study known with common measurement of student achievement. The study produced findings on leadership, culture, climate, efficacy, commitment, assessment, and programs and practices. The principle findings were that the principal's leadership relates directly to student achievement