When DS was given a speech eval, they also gave him the SBIV. He was 3.5yrs old at the time. The next year he was re-evaluated and they did part of the SBIV again. She commented on how quickly he was answering and that perhaps he had remembered the questions/answers from last time. She verified that it had been at least 11months since he had been last tested, which it had, so the results were valid. In actuality, I think it was because he was reading the pages ahead of her reading them to him.