Thesis advisor: Diana Pullin / Using qualitative research methods, this study looked at the role of the single-sex versus the coeducational school environment as a key factor in determining boys' perceptions of success in French communicative activities as defined in Standard 1.1 of ACTFL 's et al Standards for Foreign Lanquage Learning : Preparing for the 21st Century (1999). A total of twenty-four boys (twelve from a single-sex high school and twelve from a coeducational institution) were observed in class and subsequently interviewed. The goal was to determine if cognitive gender differences surounding foreign language communicative activities, socio-cultural concerns as respects boys' perceptions of the appropriateness of high achievement in French, and teacher pedagogy all lend themselves to the single-sex environment such that it provides a more fertile setting for boys' high achievement. The findings indicated that the single-sex sample's self-perceptions of competence were healthier in the single-sex environment for a variety of reasons. The single-sex school boys were more willing to work hard against the perception held by both sample sets that girls may possess an innate advantage in the speaking skill, they held a wider definition of what is appropriate male behavior (which included high achievement in French), and they (together with their coed counterparts) found the all boys environment more accepting of errors and more risk-friendly in general - crucial ingredients for developing the French speaking skill. The single-sex sample more willingly embraced school as a rigorous academic forum, whereas the coed sample was more likely to see school as appropriate for building social skills and for cultivating an understanding of the opposite sex. These findings suggest that the single-sex classroom environment is superior for boys as they strive to achieve in female sex-typed arenas such as French communicative activities. / Thesis (PhD) — Boston College, 2008. / Submitted to: Boston College. Lynch School of Education. / Discipline: Educational Administration.