With this Phase I funding, the project team will develop and test a prototype of a hardware and web-based social and behavioral intervention to improve self-regulation (SR) of students in grades 3 to 5. The prototype will include a wearable wristband that gently vibrates from time to time during the school day to prompt students to indicate their level of SR (e.g. level of focus, attention, self-control). The prototype will also include a game-based intervention to facilitate improved SR, a back-end data system to capture data, and a dashboard for students and teachers to track levels of SR over time. At the end of Phase I in a pilot study with 60 students (grades 3 to 5) in six classrooms, the researchers will examine whether the prototype functions as planned, if students understand and can use the feedback provided by the wristband to make decisions about their level of SR, and how teachers use information from the dashboard to inform instructional practice on individual students.