Everyone agrees that school in the fall cannot look the same as it did before the pandemic. Education leaders must organize people, time, and money to make up for learning losses, help students reconnect with schooling, support students' increased social and emotional needs, respond to physical distancing and sanitation requirements, and provide for teachers and students who don't feel safe attending school or who contract the virus. In this ERS Briefing, we outline a process for school district leaders to choose and adapt the "COVID Comeback School Models" that are right for their communities. We also have a calculator that helps district leaders understand the high-level configuration of models that is feasible given staffing and facilities constraints as well as key trade-offs and resource shifts. These steps are designed to build on assessments made by school systems to understand technology, transportation, physical plant and operational issues associated with physical distancing, as well as engagement with families, educators and partners about how students and adults could interact in a shared physical environment this fall. They help district leaders design a coherent approach, built on careful resource trade-offs, to develop in-person, remote and hybrid models of school for the fall.