Play and liberty: A brief incursion into some ideological currents in the history of systems-oriented family therapy.

We reflect on family therapy and its history from two points of view, as an entity that becomes understood with the help of a twofold concept of a game, and a twofold concept of liberty. Systemic family therapy has always been comprehended with the help of game theory. Its development becomes more properly understood if we keep in mind that game itself is a dualistic concept entailing both a cultural and a logico-mathematical interpretation of a game.