The program is considered successful when the presenting or underlying problem has been resolved or shows significant improvement. In many cases, even when the underlying problem is improved, such as a reading difficulty due to poor auditory processing, some time and training will be required for the client to catch-up to their appropriate age level. In the case of inattention, the child will show increased ability to sustain attention. With irritability and mood changes, the mood shifts are generally resolved and the person is happier. The same can be said for sensory processing, emotional regulation and social skill difficulties.