Abstract
A new approach for analog circuit simulation and troubleshooting, based on the fuzzy logic paradigm, is presented in this paper. This approach allows to deal with soft faults, single or multiple ones, and with both impreciseness and uncertainty of information. It has been implemented in a system named FLAMES (Fuzzy Logic ATMS and Model-based Expert System), of which details are provided, together with different experimental results, for both simulation and troubleshooting processes.