  This paper presents a novel method for assessing multiple fault
diagnosability and detectability of nonlinear parametrized dynamical models.
This method is based on computer algebra algorithms which return precomputed
values of algebraic expressions characterizing the presence of some constant
multiple fault(s). Estimations of these expressions, obtained from inputs and
outputs measurements, permit then the detection and the isolation of multiple
faults acting on the system. This method applied on a coupled water-tank model
attests the relevance of the suggested approach.
