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While the dynamics of the dissemination of management tools have been the subject of numerous articles, the relevance of their use is rarely questioned. In this article, we focus on management tools that are successfully disseminated. Does this success mean that they effectively inform decision-making? We study this issue in a particular context, that of services, through the example of decision-making related to capacity management. To do this, we draw on seven years of experience as a continuing education program lead. This research analyzes the disconnect between the dissemination of management tools and their ability to inform decision-making. For an instrument to be effective, it must be adapted to the context under study. Management accountants have a major role to play in this adaptation.