The following were observed as the results of questionnaire survey for building users and experts. They all have a clear idea and they want to suppress hazard severity to a small level. This is more evident for "hazard to human life" and "loss of property value" than for "function of building". If the fuzzy relation is used, the membership functions with respect to the structural damage level can be obtained from the performance requirement level. The performance requirement level is determined by users and owners for "hazard to human life" and "loss of property value". It thus becomes possible to convert the performance requirement level determined by users and owners to a structural damage level.
