This project team will develop and test a prototype app of a screening assessment for children who are Spanish-English Dual Language Learners (SE-DLL) in early education. The prototype will provide formative assessment reports to teachers to guide their decision-making, and will include a series of videos to increase knowledge on core competencies of supporting SE-DLL children. At the end of Phase I in a pilot study with 7 teachers, the researchers will examine whether the prototype functions as planned, is easy to use, and provides useful recommendations that teachers can incorporate into practice.