Ask HN: What are good user interfaces to decision support systems?

I searched around but came up only with either industrial, proprietary desktop apps with no screenshots or academic papers. But I'd like to know, in a very mundane way, how users (possibly unsophisticated or without much training) would interact with a DSS. Text? Q&A? Buttons? Point and click? Speech? In particular, web browser based interactions. The system would need to gauge the level of expertise of the user and adjust its services accordingly. Is there a good example of such systems that is publicly viewable? Ideas or pointers, anyone?