This monograph on the teacher center movement in the state of Maryland is divided into four sections: (1) The Center Concept and Center Research; (2) The Center Coordinator, Catalyst in Professional Development; (3) Professional Development through Inservice; and (4) The Center and its Make-Up. The first article traces the development of the teacher center movement in Maryland, a cooperative venture by the Maryland State Department of Education, the Montgomery County School System, and the University of Maryland at College Park, which began in 1964 and continues to the present. Research findings about center operations at the University of Maryland are reported in relation to the basic question of whether or not there are observable differences between teachers who participate in the centers and those who do not. The role of the teacher center coordinator is seen as one of a catalyst, motivating the educators in the center until all objectives are achieved. Inservice programs in one teacher education center involving a junior and senior high school are described, and principles concerning inservice education derived from the center's activities are identified. A model for the articulation and integration of personnel needs through collaborative efforts of several centers in the inservice program is also presented. Other articles discuss the ways various centers operate on an extension of the concept of management by objectives; a center is viewed from the vantage point of an educator assuming various positions in the center; and a representative year's program is detailed. The final article addresses four functions for a center and reflects upon the future of the teacher center movement. (MM)