Cognitive therapists tend to focus on specific problems. These therapists believe that irrational thinking or faulty perceptions cause dysfunctions. A cognitive therapist may work with a client to change thought patterns. This type of therapy is often effective for clients suffering from depression or anxiety.Behavioral therapists work to change problematic behaviors that have been trained through years of reinforcement. A good example of behavioral therapy would be a therapist working with a client to overcome a fear of heights. The therapist would encourage the client to gradually face their fear of heights through experience. The client might first imagine standing on the roof of a tall building or riding an escalator. Next, the client would slowly expose themselves to greater and greater levels of their fear until the phobia diminishes or disappears entirely.