stylistic:tone
Practical origins

WWII created practical pressures on military psychologists, they had more patients to see and care for than time or resources permitted. The origins of group therapy are here. Eric Berne's progression of books shows this transition out of what we might call pragmatic psychology of WWII into his later innovation, Transactional Analysis, one of the most influential forms of humanistic Popular Psychology of the later 1960s-1970. Even though transactional analysis was considered a unique methodology, it was challenged after Berne's death.