Bringing an evidence base to classic writings that opened psychotherapy up to more than one person at a time?the couple. World renowned for their work on divorce prediction, here John M. and Julie Schwartz Gottman examine a couples therapy classic: Ludwig von Bertalanffy's 1968 collection General System Theory. This book transformed therapy, but until now there hasn't been a researched-based demonstration that these ideas work. Using the latest research tools, the Gottmans complete the promise of this early work.