This article clearly defines the three crucial pre-implementation principles to maximize the success of Smaller Learning Communities (SLC) in large high schools. Establishing clear understanding for the need of the SLC initiative is the first of these principles. Long term commitment to a sustained plan for relevant SLC professional learning opportunities will guarantee proper training, skills, and knowledge for those working within the SLC school. The final principle defined within this article is the establishment of a foundation for professional learning communities. The absence of any one of these principles can seriously affect the success of a SLC school.