T-Groups and the like

Not sure if really systems thinking but hugely influenctial…

History: https://www.edbatista.com/2018/06/a-brief-history-of-t-groups.html
Wikipedia: https://en.wikipedia.org/wiki/T-groups
Training Groups, Encounter Groups, Sensitivity Groups and Group Psychotherapy: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1517989/