This proposal to the NSF describes a new phase of research planned in LOGO. Previous phases have concentrated on developing a conceptual superstructure (theories and teaching methods) and a material infra-structure (hardware and software) for a new style of using computers in education. We now want to test, to prove and to disseminate the results of our work, which will, of course, continue along the lines of the early phases. Part 1 is an overview of where we are and what we have to do next in the historical framework of the uses of computers for education. Parts 2 and 3 focus more on the specific content of the work planned for the next three years (1976-79).