In this paper, we have shown that information presentation in SDS can be improved by an approach that combines a user model with structuring of options through clustering of attributes and successive refinement.
when presented with dialogues generated by a system that combines user modelling with successive refinement (UMSR) and one that uses refinement without reference to a user model (SR), participants reported that the combined system provided them with a better overview of the available options and that they felt more certain to have been presented with all relevant options.