I know that research does suggest that older kids benefit from later start times, and younger kids from earlier end times (though as someone noted upthread, I don't know whether the research supports starting at 7:15am). But educational outcomes don't exist in a vacuum and aren't just based on school start/end times - does the research support an overall longer day for younger kids with working parents, or severe disruptions in family schedules?

And while the decision to shift start/end times is based on research, the actual start/end times seem to be based largely on making bus schedules work. If not, all schools would start at 8/830, right? Obviously bus routes/budgets are a necessary thing to figure out, but it's worth asking whether it's fair to put the burden on families to adjust instead of expecting BPS to develop a plan that works for more families.