This paper presents Decision-making in Collaborative Networks and enlarges the differences between strategic-tactical and operational decisions. The common way of representing decisions into classical BPMN diagrams is shown, with its drawbacks. The new OMG's standard DMN (Decision Model and Notation) is introduced, with its context and its main elements. Then, the association between BPMN and DMN is detailed and the advantage of their separation is illustrated into examples. At last, the related experiments (already done and future works) are demonstrated: a graphical editor for modeling and an automatic code generator from a Model-To-Text transformation.