Professional Development Kit (PDK) was funded by the U.S Department of Education in collaboration with SRI, International, to create professional development tools for adult educators. Employing case-based instruction in the context of facilitated adult education teacher professional development, PDK can adult educators explore and develop their practice in new ways and to investigate new materials and strategies for instruction. With video case studies of adult education classrooms; online tools for practitioners to structure their own cases; resources that include a knowledge database, digests, portfolio, group discussion and class products; and staff development and user guides; PDK provides resources and a framework to support participants efforts to generate questions and brainstorm solutions to challenging professional situations. PDK is available on CD-ROM, and some of its tools may be accessed online at Literacy.org.