This dissertation studied the development of a professional learning community (PLC) at an elementary school using action research. The study focused on the 6th grade math PLC. Through looking at baseline data, team reflections, and using tools to evaluate PLC characteristics, the team identified areas for improvement like increasing attendance, developing trust, and collaborating more. Over time, with a commitment to regular reflection and establishing group norms and structures, the functioning of the PLC improved significantly. The study concluded that the principal plays an important role in facilitating PLCs and that changes in team membership can also impact a PLC's development.