The document discusses teacher collaboration strategies and outcomes. It describes a program called SITTE that used teacher collaboration to improve student outcomes in algebra. Through collaborative lesson planning, examining student work, and focusing on teaching tools rather than topics, SITTE helped teachers develop students' basic skills in meaningful ways. As a result, students scored higher on assessments and passage rates for algebra increased. The document also discusses facilitating teacher collaboration through professional development programs, common planning periods, and overcoming barriers like time constraints.