Group therapy is an exposure-based large-group one-session treatment (LG-OST). It builds on the remarkable advances made in the development of highly effective cognitive-behavioural treatments (CBT) for various mental disorders. So-called ‘exposure strategies’ are at the heart of these approaches.

Exposure therapy refers to ‘repeated, systematic exposure to cues that are feared, avoided, or endured with dread’.

Whether the therapy is delivered in vivo (ie, involving actual objects, events or situations),