Further Results in Qualitative Uncertainty

This paper extends previous work on propagating qualitative uncertainty in networks in which a general approach to qualitative propagation was discussed. The work presented here includes results that make it possible to perform evidential and intercausal reasoning, in addition to the predictive reasoning already covered, in networks quantiied with probability, possibility and Dempster-Shafer belief values. The use of these forms of reasoning, which include the phenomenon of \explaining away", is illustrated with the use of a medical example.