The paper presents the elements of a new methodology to control complex and hypercomplex socioeconomic structures. The control process is iterative, combining the principles of System Dynamics, Control theory and the PROME-THEE Multicriteria Decision Aid (MCDA) methodology. It consists of three main stages: setting up and calibration of a quantitative model, de®nition of long-term strategies and short-term control. The purpose is to de®ne within a panel of decision makers appropriate strategies towards long-term goals, and to implement suitable control measures. These should in particular help cope with progressive and catastrophic variations in the behaviour of the system.

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