As a mother of 3 kids 4yo and under i have visited my fair share of arlington preschools...yeah, like 9 i'd say. we ended up switching one of our kids into westover from a co-op. it sounds terrible but i just canNOT be bothered w/a co-op, i can't. i don't use a nanny and we have no family in the area so i NEED those few hrs, as does my child(ren). we found westover and the staff is FANTASTIC, the other families are great and it was one of the few places that takes infants as well _SCORE. can't say enough good things about this terrific little community.