Self-help groups are an efficient and inexpensive way of dealing with large numbers of people. They are composed of peers who share a similar mental, emotional, or physical problem. Usually, groups are led by peers and have an informal structure. These groups are not for every person. Some people still will require (a combination of) individual treatment and/or more specialized treatment. Thus, group leaders must know their limits and know when to refer the person to someone at a higher level. However, it is essential, however, that there be good training and supervision. The CWWPP has more then 20 years of experience in education for leaders of self help groups.