This poster will cover the evolution of progress toward short- and long-term goals in implementing a multi-level federally-funded initiative aimed to increase participation of students from underrepresented populations in gifted and talented (GT) education. It presents program context and the program logic model and focuses on the methodological approaches used to establish indicators of implementation outcomes and development of appropriate instruments aligned with the components of the logic model. The poster will also detail strategies of multi-site data collection activities targeting different audiences (school administrators, teachers, and students) across a three-year period. Challenges are described along with lessons learned about: 1) addressing challenges to collecting quality, consistent, and comparable data across sites; 2) creating online structures to manage multi-site data collection efforts; 3) need for ongoing update of instruments to adequately capture progress over time; and 4) impact of program staff turnover on professional development.#Cluster,Multi-SiteandMulti-LevelEval #2013Conference #underservedpopulations #MixedMethodsEvaluation #Prek-12EducationalEvaluation #Giftededucation #Instruments