Coping with complexity is at the heart of the systems approach. Several methodologies can be discerned which have proved to possess extraordinary power in dealing with complex issues. System dynamics is a general-purpose methodology for modelling and simulation employed in order to deal with dynamic complexity. Cybernetics has brought forth structural models to enable organizations to deal with the complexity of their environments. The main proposition of this paper is that these two methodological strands show potential synergies. A proposal for leveraging the complementarities of system dynamics and organizational cybernetics is made. The paper also argues that it is necessary to conflate qualitative and quantitative modelling and design approaches, as well as to improve the quality of models and strategies by strengthening the processes of validation. At a higher level of abstraction, the author postulates that, for the sake of relevance, this methodological synthesis is to build upon both the positivist and interpretivist traditions. On this basis, a framework called integrative systems methodology is proposed to help actors at different levels to achieve the requisite variety.