Development of a viable in-situ technology offers the potential of both significant environmental advantages and an increase in the amount of recoverable resources. The program described in this report is directed specifically toward research needed to overcome the technical obstacles that have retarded the development of in-situ processes. The program goal is to develop, by 1980, several commercially viable technologies for the in-situ production of shale oil. National in scope, the program is expected to be undertaken with private funds in part with joint Federal/private financing and, where neither is feasible, wholly with Federal funds. The Federal Government would provide overall program management to ensure that all parts of this highly interrelated program move forward harmoniously. Although emphasis is directed toward the oil shales of Colorado, Utah, and Wyoming, research would also be initiated on the oil shale deposits that underlie much of the Eastern United States. A number of feasible in-situ technologies would be tested in various oil shale resource types.