Professional Learning Communities are an important means toward the goal of improving schools so that students can learn at high levels. Professional Learning Communities, when well-implemented, have a laser-focus on learning, work collaboratively, and hold themselves accountable for results. In this article, the central concept of "implementation fidelity" is studied due to its undoubted importance. Furthermore, a survey method is suggested for assessing implementation. This method assessed the three key components of a true PLC: (a) Learning as our fundamental purpose, (b) Collaborative culture, and (c) Results orientation. Implications for practice are discussed, including the impact of the implementation fidelity check on student results.