Salvador Minuchin (1921—) is one of the pioneers of family therapy. He developed a school of family therapy called structural family therapy. In this approach, Minuchin emphasizes the importance of boundaries. Boundaries refer to the lines between different family members or subsystems that mark the limits of influence, information, and decision-making power. For example, there needs to be a clear boundary between parents and children. Children do not need to know about the sex lives of their parents or the details of their financial situation. Moreover, children should not have undue influence on their parents’ marriage.