A growing number of schools are piloting or implementing blended learning programs. However, many educators are unfamiliar with the different aspects of this approach and how the various implementation models of blended learning differ.Technology-laden terms like “one-to-one” and “flipped learning” make blended learning an intriguing if not daunting endeavor. However, the foundation of blended learning remains firmly rooted in the concept of empowering teachers to provide personalized and mastery-based instruction.This whitepaper will review the critical success factors to keep in mind if your district is in the process of exploring or implementing a blended learning approach. But first, let's review the basic definition of blended learning and some of the most common implementation models.