This paper deals with qualitative and structural reasoning on linear interval systems whose parameters are specified by intervals . We formalize the systems of reasoning about structures of interval systems by the qualitative perturbation principle : the interval system would have the interval property when its underlying sign structure include the component that has the corresponding sign prop...

A statistical model is presented for use in validation of qualitative methods. This model, termed Probability of Detection (POD), harmonizes the statistical concepts and parameters between quantitative and qualitative method validation. POD characterizes method response with respect to concentration as a continuous variable. The POD model provides a tool for graphical representation of response...

We present a paradigmatic example of a feedbackcontrolled system: an electric motor with sensor and controller. Diagnosis of this system is performed based on a qualitative model that reflects deviations of parameters and behavior from a fixed reference state. The hypothesis that has been examined in this case study is that detection of behavior discrepancies does not necessarily require simula...