LAUP started a Teacher Institute during the 2009-10 program year as part of its commitment to the professional growth and development of preschool teachers. The goal of the Teacher Institute was to strengthen the capacity of LAUP lead teachers with respect to the behaviors and competencies assessed in the Instructional Support dimension of CLASS. The Research and Evaluation Unit conducted an analysis of the Teacher Institute from 2009-10 to 2012-13. In general, the following findings emerged: Overall, teacher feedback about the Teacher Institute was favorable, although suggestions were made for more hands-on opportunities; The amount of support received from coaches to implement instructional practices covered in the Teacher Institute varied across the years; For three consecutive years, the Teacher Institute appears to have increased participating teachers' selfreported use of instructional support practices; Limited time to plan and prepare was the biggest challenge for teachers trying to implement the instructional practices covered during the Teacher Institute (author abstract)