Nearly every school of thought is in agreement that self-disclosure is a necessary element of therapeutic technique. Self-disclosure by the therapist is often thought to facilitate increased disclosure by the client, which should result in increased understanding of the problem at hand. It helps to acknowledge the therapeutic relationship as a fundamental healing source, as an alliance between client and therapist is founded on self-disclosure from both parties. In some respects it is similar to modeling appropriate social behavior. Establishing common interests between therapists and clients is useful to maintain a degree of reality. Establishing such interests is especially beneficial in therapists' relationships with children, especially teens, who need to understand that the therapist is not an authority in order to fully benefit from therapy.