This list contains some approaches that may not call themselves psychotherapy but have a similar aim, of improving mental health and well being through talk and other means of communication. In the 20th century, a great number of psychotherapies were created. All of these face continuous change in popularity, methods and effectiveness. Sometimes they are self-administered, either individually, in pairs, small groups or larger groups. However, a professional practitioner will usually use a combination of therapies and approaches, often in a team treatment process that involves reading/talking/reporting to other professional practitioners. The older established therapies usually have a code of ethics, professional associations, training programs, and so on. The newer and innovative therapies may not yet have established these structures or may not wish to.