1. An analysis method, comprising: accepting an input model of a real-world process defining the relationship between a plurality of parameters, including n input parameters which may be varied and at least one output parameter representing an aspect of the output of the system, where n is at a positive integer; estimating the sensitivity of the output parameters to the input parameters in a plurality of regions of values of input parameters of the model; and locating regions of values of the input parameters of the model where the output parameter is relatively insensitive to variations in the input parameters.