The construction of agreements about the nature of the problem confronted by a group can be seen as the aim of problem structuring methods. Visualizing issues to facilitate the discussions plays a protagonist role in the process. However, we lack methods to study this kind of interaction and therefore we know little about how these visual artefacts catalyse the structuration of the problem. This paper builds towards these two interrelated issues by analysing the interactions using Boundary Games, a theoretical synthesis based on