Every child is unique in the speed their acquire new skills. However, if your child is accessing an intensive behaviour intervention programme (e.g., 21+ hours per week) then you should begin to notice changes within the first three months of service. There are a number of key skills that we look at to predict overall progress and response to an ABA programme such as imitation skills, consistent response to their name, requesting (manding) skills, and listener skills (i.e., receptive language skills).