For five years, an experimental program in multilingual education has been functioning in Boyo Division in the North West Region of Cameroon. In this program, 12 experimental schools use the local language—Kom—as a medium of instruction in Classes 1-3. After Class 3, children in the experimental schools return to the standard practice of English-only instruction. The 12 experimental schools are matched with 12 comparison schools which continue to use English as the language of instruction. At the end of year 5, standardized testing was once again completed for children in both comparison and experimental schools in Class 5. The findings are presented in the various sections of this report.