This study evaluated the Primary Learning Communities (PLC) program, a non-graded kindergarten through second-grade alternative curriculum piloted in three Houston, Texas, elementary schools. The curriculum allows a multi-age mixing of students with ages between five and seven years in the same classroom. Approximately 600 students and 27 teachers participated in the evaluation. PLC and non-PLC teachers were surveyed, and a random sample of PLC classrooms were visited to collect observational data. Survey data were analyzed with descriptive and qualitative procedures. Results indicated that the program's content, flexibility, and underpinning philosophy met the varied instructional needs of students through student activities which enhance each student's strengths, interests, successes, and motivation. PLC curriculum rated as more effective than the traditional curriculum in the development of math and reading skills, self-esteem, social skills, positive attitude toward school, and self-discipline. The study concluded with many recommendations proposed by the program staff for enhancing the effectiveness of the PLC program. (MM)