It was developed by Dr Chan Gunn while he was a physician at the Worker's Compensation Board of British Columbia in the '70s, where he investigated the large number of mysteriously stubborn cases after frustration with the ineffective modalities at his disposal.
Lwakhiwe nguDkt Gunn ngesikhathi udokotela ngesikhathi Isisebenzi sika Isinxephezelo Board of British Columbia ngawo-70, lapho wenza uphenyo inani elikhulu amacala engaqondakali nenkani ngemva ukukhungatheka ne Timiso ayizwakali akhe khucululwa.