Computer-mediated discussion processes play an important role in achieving sustainable development. However, when part of authoring complex documents, these discussions have so far not been very effective. One reason is that in the design and application of the information tools supporting discussion, the social context is not sufficiently taken into account. We outline a social context model for discussion process analysis. The GRASS tool for group report authoring and the freeText tool for document review are authoring tools in which the social context of discussions is given explicit attention. Analyzing GRASS and freeText, we show how the model could be used to construct information tools that enable more effective discussions.