Context modeling and management are intrinsic parts of the decision-making process, especially in domains dealing with knowledge and reasoning. Actors make a decision jointly with the modeling of the context at hand. However, such a co-building of the decision-making and of the specific model of context is generally left implicit, and one generally retains {decision-making, solution} instead of {decision-making, context, solution}. Then, any reuse of a successful decision-making requires a complex phase of contextualization, decontextualization and recontextualization. This problem is well known in the scientific-workflow community—a scientific workflow being a kind of decision-mak implementation—for which we propose a solution. In this paper, we present a solution for decision-making, pointing out similarities of the approach with scientific workflows, their consideration related to task realization, and their integration in the notion of activity management. The key point is to consider decision-making through its entire processing and not its solution only. This shift of paradigm is possible, thanks to the Contextual-Graphs formalism and its uniform representation of knowledge, reasoning and context. A running example illustrates the contribution of this context-oriented approach for representing the contextualization process of decision-making.