We took charge and had to move on from N75 to the last chapter in Dr. Rosemond's book. We put them in separate bathroom and told them to tell us when they went. They did. Then when they had an accident, we put them in our "simmer time" room because we knew it was an accident, it was them being defiant. After that, they haven't had an accident and now are going on the big potty with no seat, wiping, flushing, and washing their hand - all in less than 10 days with twins.
The only thing we haven't accomplished is their going at other places. They have held it for hours at preschool or if we go out to only go at home. I have showed them the pottys elsewhere and their teachers have encouraged them, but they haven't gone. Any advice?