Issues in the implementation of peer coaching, a collaborative process for teacher improvement, are examined in this booklet. Included are a definition of peer coaching; a discussion of a variety of peer coaching activities; an outline of specific observation, data collection, and conferencing strategies; guidelines for designing a site-based peer coaching program; and a discussion of the principal's role. Contextual variables that influence the success of peer coaching efforts are explained, and strategies are presented for maintaining program momentum. A personal planning guide is presented to identify appropriate next steps. The appendix lists Association for Supervision and Curriculum Development (ASCD) resources. Seven figures are included. (37 references) (LMI)