The unit is another in the series developed from materials produced and field tested by the Project Social Studies Curriculum Center. The Trobriand society was chosen for study in this resource unit for upper elementary grades because its economic system illustrates the importance of reciprocal relationships which continue to be very important in many societies of the world. The system has some aspects of both a command and market economy. Although the unit is focused upon the economic system, the Trobriand culture is presented as a total culture and the interdependence is made clear. The objectives, generalizations, and skills are basically the same as those described in SO 001 276. Teaching strategies, educational materials, and some student activities and textual materials are also included. Other documents in this series of curriculum guides are ED 051 026 through ED 051 033, ED 052 080 through ED 052 082, and SO 001 277. (VLW)