Several studies identify collaboration between classroom teachers and teacher-librarians as a key factor that affects student achievement. Studies in teacher-librarianship have established procedures and processes for effective collaboration. This study examines collaboration from a broader theoretical and research perspective, beginning with 20 factors that specifically influence successful collaborations. These are clustered in six areas: factors related to the environment, to membership characteristics, to process and structure, to communication, to purpose, and to resources. Research from teacher-librarianship is then applied to substantiate and reinforce the factors and provide context for successful collaboration and thus effect on students\u27 learning in schools. Reprinted by permission of the publisher