In fall 2009, the Bill & Melinda Gates Foundation launched the Measures of Effective Teaching (MET) project to develop and test multiple measures of teacher effectiveness. The goal of the MET project is to improve the quality of information about teaching effectiveness available to education professionals within states and districts--information that will help them build fair and reliable systems for teacher observation that can be used for a variety of purposes, including feedback, development, and continuous improvement. To help identify the best mix of teacher effectiveness measures, more than 3,000 teacher volunteers are participating in the MET project across six predominantly urban school districts: Charlotte-Mecklenburg Schools, Dallas Independent School District, Denver Public Schools, Hillsborough County Public Schools, Memphis City Schools, and the New York City Department of Education. As the MET project progresses and the researchers learn more about teacher effectiveness, how to measure it and how to increase the quality of information and tools used within state, district, and school evaluation systems, they will share a series of publications and tools more broadly. Their reports will address the following topics: (1) interim findings and results; (2) study design, methods, and empirical analyses; (3) teacher observational protocols, training, and scoring requirements; (4) final findings and results (fall 2011); and (5) implementation guides and data requirements, showing how to use the composite measure and gather and store the data. (Contains 7 endnotes.)