Acknowledgments. A special thanks to Justo Avila for his steady leadership of the project at the Los Angeles Unified School District (LAUSD), along with Cynthia Lim, Kathy Hayes, and the district's research committee for helpful guidance along the way. Appreciation goes to Erin Coghlan for her fine research assistance. Over six hundred busy teachers took time to participate in the study. The encouragement and interest of their principals was essential as well. Funding for this effort came from LAUSD and the Spencer Foundation of Chicago. Thank you all.

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