This unit is one of several being prepared as a part of a geography course based on a settlement theme provisionally planned for tenth grade students. The materials are part of a larger proto unit on "A Structure of Geography." The original unit was tried out during the spring of 1965, then revised for the limited school trials. The regional trials were conducted in conjunction with the Intra-Urban and Fresh Water Units during the fall of 1965 in four areas; California, Illinois, Ohio and New Jersey with a total of 47 teachers and approximately 2200 students participating. Teachers administered the School and College Ability Tests (SCAT) form 2A, and the Introductory and Intra-Urban unit tests as pre- and post-tests. Significant impressions of the unit were recorded on questionnaires by teachers, students, and observers. In conclusion, the response was positive, and the materials seemed appropriate for high school students. Suggestions for improvement include: revision of the text to make it more readable, and revision of the guide to provide more background teacher material and suggestions for supplementary readings and activities for students of varied ability. See SO 000 443 for a list of the related reports. (SBE)