Preschool is expanding nationwide, yet little rigorous evidence exists about which preschool practices constitute high-quality programs and lead to gains in student outcomes. MIT Blueprint Labs will share what we already know about preschool effectiveness. We will then dive into small group discussions to hear your perspectives on the most pressing and actionable research questions and how to make research more inclusive. We will close the session with a large group share out to begin to reach consensus on the most important unanswered questions.