This collection of papers focuses on what is known and practiced in professional development. Part 1, "The Purposes of Professional Development," includes (1) "Educational Purposes and Teacher Development" (Maxine Greene); (2) "Going Public: The Imperative of Public Education in the 21st Century" (Carl D. Glickman and Derrick P. Alridge); (3) "Professional Development in Pursuit of School Reform" (Judith Warren Little); and (4) "Beyond Certainty: Taking an Inquiry Stance on Practice" (Marilyn Cochran-Smith and Susan L. Lytle). Part 2, "Contexts, Strategies, and Structures for Professional Development," includes (5) "Teacher Learning at the Intersection of School Learning and Student Outcomes" (Jacqueline Ancess); (6) "Teachers Engaged in Evidence-Based Reform: Trajectories of Teacher's Inquiry, Analysis, and Action" (Milbrey W. McLaughlin and Joel Zarrow); (7) "School-University Partnership as a Venue for Professional Development" (Lynne Miller); (8) "Professional Learning through Assessment" (Beverly Falk); (9) "Lessons from an Inquiring School: Forms of Inquiry and Conditions for Teacher Learning" (Laura Stokes); (10) "The Narrative as an Experience Text: Writing Themselves Back In" (Anna Richert Ershler); (11) "When Teachers Write: Of Networks and Learning" (Ann Lieberman and Diane Wood); (12) "Teacher Research and Professional Development: Purposeful Planning or Serendipity" (Sarah Warshauer Freedman); and (13) "Students' Work and Teachers' Learning" (Joseph P. McDonald). (SM)