Reasons why group therapy works:

1. The quality of treatment is not dependent on theoretical orientation.

2. Cohesiveness is provided by factors that propel a person to remain in group therapy. Conditions for cohesion include warmth, comfort, sense of belonging, value placed upon the group, and the feeling of being unconditionally accepted.

3. Esprit de corps and individual cohesion (the attraction of an individual to the group) are interdependent.

4. Cohesiveness can be considered as the sum of feelings of togetherness of all members.

Understanding group cohesiveness:

By definition, cohesiveness refers to the attraction that members have to their group and to its members. Members of cohesive groups are supportive and accepting of each other, and they are inclined to form meaningful relationships within the group. Cohesiveness seems to be a significant factor in successful group therapy outcomes.

Those with a greater sense of solidarity or wellness value the group more highly and will defend it against internal and external threats via voluntary attendance, participation in sessions, mutual help, and upholding the group standards.

Cohesiveness as a therapeutic factor in group psychotherapy:

Being accepted by others despite personal fantasies of being unacceptable or unlovable is a potent healing force. Provided a person adheres to the group's procedural norms, the group will accept that individual regardless of his/or her past life, transgressions, or perceived social failings. Deep human contact is experienced.

Responding as if the group were watching actions outside sessions, individuals may internalize the group's attitudes and standards. Often therapeutic changes persist and are consolidated because the members are disinclined to let the group down.

Yalom concluded that group cohesiveness is in itself of therapeutic value and is essential for perpetuation of the group.