Action research has the potential to reconstruct schools into professional learning communities that are able to identify educational issues and develop appropriate solutions for 21st century learning. Increasingly, teacher education programs are providing action research experiences to encourage analytical thinking and problem-solving skills (Darling-Hammond, 2009, 2012). The purpose of this study was to critically examine the experiences of the teacher educator and teacher candidates involved in the implementation of an action research component over four years in a revised consecutive initial teacher preparation program. A case study design using action research methodology was used in the research, which provided the tools to explore a complex phenomenon within its context: the implementation of an action research assignment in a core course in a teacher preparation program. The perceptions of the faculty teaching the course and the teacher candidates (n=544) in each of the four years provided insight into challenges, benefits, and lessons learned. The discussion centers on the implementation of action research in a compulsory course in a teacher education program; identifying opportunities and limitations settled into four main categories: structural incongruence, reflection, growth, and recommendations.