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Piaget did not explicitly address attachment. By viewing psychology as the continuation of vital adaptation or re-adaptation, however, he offered a formulation for it. Starting from this biological basis, his description of the evolution of cooperation during psychogenesis informs us about attachment during the different stages of the life cycle. Indeed the fundamental question of the construction-reconstruction of a specific attachment bond re-emerges at each of the stages of this cycle. Re-formulated in a Piagetian framework, this question becomes that of the construction and the permanence of a shared subsystem of value. The therapeutic system that we present has been developed around the recurrent possibility of addressing this question.