Sometimes it takes kindergarten registration which generally happens Jan-Feb to motivate the child to do it in the sense of telling them they can't go off to school in diapers - if you are big enough to go to school then you are big enough to wear underwear so if you want to go to school you need to get potty trained, give up the soother, give up the blanket, bottle, lovey, whatever vice they have held onto from infancy. It then becomes self initiated and that makes such a difference in success.

It also helps to motivate the parents to realize oh yeah this does need to happen first.....