A support group type of setting may have little or no therapist interaction while individual therapy in a group setting may have considerable therapist interaction. (psychology.wikia.com)
Some specifications such as group type, group size etc. are only applicable for group life insurance plan. (life.indiainsured.com)
Now, there exists a third group type, restricted, which outside users can request membership to, but only group members with permissions can allow them in, similar to closed groups. (neowin.net)