f c World Scientic Publishing Company 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 pre-sented here includes results that make it possible to perform evidential and intercausal reasoning, in addition to the predictive reasoning already covered, in networks quantied 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