They take into consideration all of your observations from home, school and other places. They talk about social
calming, actitivities that he can perform, all his quirks. Then they work with him on specific things to see how he does. Part of it involves interrupting his play plan to see how he handles it, if he can follow very specific directions, how he visually tracks things, if he is sensitive to sound or light or touch, how his core muscle strength is, etc.