Centre for Policy Modelling
This Centre focuses on "decision-making in environments which are
too complex to be analyzed by models based on standard economic
and related analytical techniques. This has been made possible by
the design and implementation of a computer-based modeling
language called SDML (Strictly Declarative Modelling Language)."
At this site you can find background material on SDML, details on
several projects that use it, and their discussion papers.