Elementary schools will be included in the evaluation if they are:  Considered an elementary school by the school board Open for in-person learning during the study period They have at least 200 students Offer at least 4 grades  Exclusion Criteria:  Schools that are middle schools only, that are not open for in-person learning, have fewer than 200 students or are not a complete elementary school (i.e. schools offering independent courses, prep schools with 1-2 grades, elementary schools with < 4 grades) will be excluded.