Higher Horizons 100 is a program for underachieving pupils in the seventh to 10th grades. These pupils are given supplementary and individualized instruction and support services during the day and evening. Students are divided into eight clusters. Each cluster has a staff of six; one counselor, and teachers in reading, English, math, science, and social studies. The staff for each cluster has complete responsibility for a group of about 100 pupils. Students receive at least five extra hours per week of language instruction. The program was evaluated in terms of: achievement gains, attendance, and student attitudes. Among the findings are the following: (1) students in the program made significant greater achievement gains than would have been expected without participation in the program, (2) attendance goals were met by all clusters, with margins ranging from 2.3% to 12.9% above the goals, and (3) over 80% of the pupils in the program reported in an attitude survey that Higher Horizons 100 helped them in their school work. The survey also showed that the pupils' attitudes toward school had improved. It is recommended that the program continue to operate as is, but that a better survey design be implemented during the 1977-78 school year. (Author/AM)