This paper describes a computation al implementation of the Fourie rAmp litude Sensitivity Test (FAST) and illustrates its use with a sampl e problem.The FAST procedure i s ideally su ited to t he · i. :ask of determining the global sensitivity of nonl i near ma thematical mode ls subjected to var i ations of arbitrary size in either the system parame ters or initial condition s . A FORTRAN computer program, capable of pe d ormi ng sensitivity analyse s of either algebraic or differential equati on systems i s desc ribed.*Department of Chemical Engineering The computer program presented here provides a general framework for implementation of the FAST method. When combined with a user supplied subroutine for the specific system of interest, the FAST program computes the sen si tivities of the system outputs to the parameter variations specified by the user. The method is illustrated ~ an example involving a simple autocatalytic reaction mechanism.-3-

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