The parallel curriculum model (PCM) is a comprehensive, concept-based approach to creating or revising curriculum. The model is intended to develop the strengths of a wide range of learners, including but not limited to those with high achievement and potential. PCM builds on previous theoretical beliefs concerning quality curriculum. The ultimate goal of PCM is to develop high-quality curriculum for the widest range of learners while still ensuring that the brightest learners are challenged. Through the use of the four parallels (Core, Connections, Practice, and Identity), either individually or in combination, PCM curriculum offers students opportunities to examine and engage the concepts and principles of a discipline in varied and compelling ways while growing toward expertise at an appropriately challenging level.