Sometimes it is good to know that you are not the only one with a certain problem. Meeting people who have similar experiences may help you. How does someone else deal with them? Can you learn from them or can you help them?
The groups are composed around a specific problem, for example assertiveness. Such a group would be made up of people with different issues to do with assertiveness, i.e. being too assertive or not assertive enough. You will probably recognise (and maybe feel triggered by) traits in other group members which you recognise in people you encounter in daily life (for example parents, partners, friends etc). Understanding what somebody is going through at that moment, recognition of their problems and sharing of solutions is central to this therapy. This setting is as close as you get to the “real” life and offers a great safe way to practice and learn!