This thesis documents the action research study done to investigate the perceived challenges and benefits of a project-based language learning (PBLL) approach in a high school Spanish classroom. The research involved four high school Spanish 3 classes taught by the same teacher. Two classes formed an experimental group and were taught one thematic unit using a PBLL approach, while the other two classes formed the control group and were taught by the same approach that had been used the rest of the year. Two of the objectives of the study were to see how the PBLL approach affected the achievement and writing performance of the experimental group and how the students liked it in comparison to the teaching approach that had been used in the other units during the school year. The third objective was to identify effective steps in setting up project-based language learning in a high school classroom and its possible obstacles. The results from this study found that a PBLL approach possibly affected achievement in grammar in vocabulary from the pre-test to the post-test, but that the writing performance was unaffected. In this thesis, steps to setting up a PBLL unit are documented as well as possible obstacles. The thesis concludes with suggestions for overcoming these obstacles and for further research and collaboration in setting up PBLL units.

Project-based Language Learning (PBLL) provides students with opportunities to use the target language purposefully and to interact with culturally authentic materials. Because PBLL holds critical benefits for its students, it is important that teachers learn best practices for implementation and how to overcome the challenges that PBLL brings. This study focuses on the experiences of 15 world language teachers as they participated in a PBLL professional development series developed by the National Foreign Language Resource Center (NFLRC) at the University of Hawai'i at Mānoa. Findings from this study are based on data gathered from surveys and interviews with a diverse group of educators for the purpose of gaining an understanding of what participants learned and the activities that impacted learning of PBLL. Results show that learning about gold standard elements of PBLL made the biggest impact on participants' pedagogical beliefs and motivated them to change their practice. Activities that positively impacted learning were those that were active, social, and related to practice. Participants were overwhelmed with the amount of content and needed help making connections between the content and their teaching contexts. Overall, participants' experiences in the professional development series led to a change in pedagogical beliefs and a desire to alter their implementation of PBLL.