We have strong-willed 5-year old twin boys who continue to have frequent "accidents" (urination, not defecation). It's usually when they're playing and it appears that they just don't feel like bothering with going to the bathroom. This is getting really aggravating, especially since they start school in a couple of weeks. I know we're supposed to stay calm, but it's hard not to become frustrated. They do know how to use the toilet correctly; we know this because they were in an 8-week full-day preschool class over the summer and managed it perfectly. They also do it "right" about 1/2 the time -- which isn't enough, obviously. They still sleep in diapers, neither has ever woken up dry.