quality:corruption, structural:reformatting, information:classification
"Third generation"

Since the 1980s, a series of new behavioral therapies have been developed. These have been later labeled by Steven C. Hayes as "the third-generation" of behavioural therapy. Under this classification, the first generation of behavioural therapy is that independently developed in the 1950s by Joseph Wolpe, Ogden Lindsley and Hans Eysenck, while the second generation is the cognitive therapy developed by Aaron Beck in the 1970s.