Are you thinking of starting a dual language immersion (DLI) program in your district or at your site? Research shows it to be one of the most effective programs for all students, including English Learners, as it develops high levels of academic achievement and biliteracy. This DLI Planning Guide draws upon the Guiding Principles for Dual Language Education in providing and explaining the steps in a series of modules for you to consider in order to plan and structure for the launch of a strong, successful, and sustainable DLI program.