Abstract: The invention pertains to a computer system for automated problem solving in technical systems with redundant components that via a user interface allows a skilled user to model the technical system and its components by using probabilities for causes, indications of redundant causes, probabilities that solutions repair causes, and the effects of questions on cause probabilities, and that via another user interface provides an end user with problem solving guidance by suggesting a sequence of questions and solutions, continually responded to by the user, until the failing system is repaired or all relevant solutions have been tried. The invention permits problem solving within industries where redundant components are often used to increase the safety of the system.