Groups may be homogeneous or heterogeneous. In homogeneous groups, all members share one or more key characteristics. For example, a group may be composed of people who are all suffering from depression or people who are between the ages of twenty and thirty. Many groups are heterogeneous and contain people who differ in age, type of problem, gender, and so on.

The therapist usually screens people to determine whether they would be suitable for a group, excluding people who are likely to be highly disruptive. In the group, the therapist’s role is to promote a supportive environment, set goals, and protect the clients from harm.

Group members discuss their problems and experiences with one another and consider different ways of coping. They provide each other with acceptance, support, and honest feedback. A therapy group is a place where people can practice coping strategies and ways of relating to others. Therapy groups also help people to realize they are not alone in their suffering.