These studies examine the dissemination strategies of ten selected educational innovations that illustrate a number of the problems and solutions that have emerged from past experience. In studying the diffusion of these products and programs, facts have been sought about what happened between conceptualization and implementation. The study tries to ascertain what was done at each step in the life of a product where a decision could affect its success in reaching users. Although the focus is diffusion, examination of product design and testing is also included, since the actions taken at these stages could have a crucial impact on eventual market success. The products and programs possess a wide range of types and degrees of innovational complexity and success. Their diffusion histories illustrate the diversity of tactics that have been tried. The products discussed have been developed and distributed by various combinations of research and development agencies, other nonprofit agencies, and commercial firms. Key points of general interest have emerged and are summarized to help fill a need in the diffusion literature for facts and inferences culled from practical experience, and to give advice to developers, disseminators, and funding agencies. (Author/MLF)