Understanding Language, housed at Stanford University, developed 6 Key Principles for EL Instruction. Two grant-funded projects in Arizona, Teachers of Language Learners Learning Community (TL3C) and ITeachELLs, are using these principles to develop meaningful professional development for dual language teachers and other pre-service and in-service teachers of ELs. In this interactive session, participants will have an opportunity to unpack the 6 principles and discuss how they can be helpful in their own professional growth.