Northwest Guilford High School, Guilford County (North Carolina), is an essentially rural, largely white school that serves about 1,200 students from all socioeconomic levels. An evaluation was conducted of a heterogeneous grouping project involving students in a 2-year sequence of algebra for those who scored below the 40th percentile on a standardized mathematics test and the Guided Studies program, which is for students having difficulty in English, science, and social studies. Heterogeneous grouping was begun in 1990-91 in response to the high percentage of students planning postsecondary education and the apparent polarity between college preparatory and vocational students. A survey completed by 18 teachers, interviews with a 4-member Parent Advisory Group, and a survey of the junior class provided information about the program and responses to it. Although teachers reported initial misgivings, they agreed that the change has resulted in better learning and better student grades. Parents were supportive, and student attitudes toward the program were good. Students generally felt that teachers expected more and worked to make sure students had learned the material. Program descriptions and the student survey are attached. (Contains 6 references.) (SLD)