One such system was Pathfinder, which (I believe) used a relatively simple Bayes net to diagnose within certain categories of disease. It was able to outperfor

One such system was Pathfinder, which (I believe) used a relatively simple Bayes net to diagnose within certain categories of disease. It was able to outperform pathologists in the area it was designed for because (or so I've been told) it didn't face the cognitive biases that human doctors have (like the inability to reason with probabilities, the accessibility bias, etc).