CK 12 Foundation is a non profit organization with a mission to reduce the cost of textbook materials for the K 12 market both in the U S and worldwide As a leading member of the OER movement, CK 12 is using an open content, web based collaborative model termed the FlexBook With these free, common core aligned and NSES aligned digital textbooks, CK 12 intends to pioneer the generation and distribution of high quality educational STEM content that will serve both as core text as well as provide an adaptive environment for learning through the FlexBook Platform