The purpose of this study was to investigate the relationship between school environment and effectiveness in French immersion. The two settings investigated were the immersion-centre school, where all students were involved in the French immersion program, and the dual-track school, inwhich the French immersion and regular English program co-existed. Questionnaires were developed to gather relevant information from students in Grade 7 and from teachers in both school settings. The investigation determined that immersioncentre students were perceived, by both teachers and students, to be exposed to more French and less peer pressure than their dual-track counterparts. It was also determined that there were no significant differences between the two groups in regards to student use of French or student and teacher satisfaction with the program. In conclusion, it is suggested that teachers and administrators at dual-track schools attempt to recreate the perceived advantageous conditions at immersion-centre schools in order to maximize student exposure to French and to improve school atmosphere.