The Center for Early Care and Education Research-Dual Language Learners (CECER-DLL) has developed parent and teacher questionnaires to document the characteristics of Dual Language Learners (DLLs), their families, and their classrooms, as well as DLLs' experiences with their two languages. This webinar presents the content of questionnaires, the process used to develop them, preliminary findings from a validation study, and the next steps in the development process.