First: identify the type/category of the disorder (anxiety, somatoform, dissociative, mood, schizophrenic, personality, or developmental).

Second: identify the sub category. For example if the individual is suffering from an anxiety disorder is it OCD, PTSD, phobia, panic disorder, or generalized anxiety disorder.

Third: what information provided about the individual helped you make this diagnosis?

Tray arrived at the party tense and irritable. He nervously looked around the room to see who was there. His heart began to beat rapidly and he felt slightly dizzy. At one point he began to chew on his finger nails. After only being there for a short time he decided to leave because he felt so uncomfortable.