A provocative and powerful view of practical knowledge. Schon argues that effective professionals do not simply follow the accepted body of knowledge corresponding to their field, but instead engage, intuitively, in a reflective conversation with their problems, probing them, reframing them, and relating them to previous cases. He also argues convincingly that the commonly accepted research and development model in which practitioners bring problems to scientists and scientists hand back reproducible solutions is broken and misleading. ( )