This article details a study conducted to determine the effectiveness of a professional development model for inservice Spanish teachers. Subjects were participants in intensive summer immersion programs abroad that included a rigorous methodology course advocating sound pedagogical models for lessons and stressed 90%+ target language use in the foreign language classroom. Subjects responded to an online survey requesting demographic data and provided Likert scale ratings on the perceived utility and effectiveness of program goals from their personal perspective. Results confirmed an overwhelmingly positive professional experience for participants and yielded concrete data supporting the goals of the program.