In 1957 he continued his researching career at the University of El Salvador.
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Paul Watzlawick theory had great impact on the creation of the four sides model by Friedemann Schulz von Thun and made a great impact on the development of the Interactional View for communication theory.
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Muth earned her Ph.D. in 1991 at the Swiss Campus of La Jolla University, San Diego, where she attended lectures with Paul Watzlawick and Henri Laborit.
Family systems therapy received an important boost in the mid-1950s through the work of anthropologist Gregory Bateson and colleagues – Jay Haley, Donald D. Jackson, John Weakland, William Fry, and later, Virginia Satir, Paul Watzlawick and others – at Palo Alto in the US, who introduced ideas from cybernetics and general systems theory into social psychology and psychotherapy, focusing in particular on the role of communication.