Some children are not diagnosed until a later grade, maybe fourth or fifth grade, because they've been able to successfully compensate for their reading difficulties up until then. And therefore, parents and teachers may not even notice that they're having difficulties reading. So some particularly bright children may pull in clues from other things – if there's pictures or even from the very words that they can read – they can infer enough meaning that people think that they are actually reading all of the information. Another way that children can compensate is with strong memory. For example, some children are able to memorize certain single words that is enough to get them though the assignments that they need to do. What ends up happening is as they get older and demands increase, then they aren't able to compensate so well. And they have more difficulty, they start to struggle more in school and that's when it becomes diagnosed.