Processing and display of a real world model

An analysis method takes an input model of a real world process with an output parameter, with multiple input parameters. The complexity of regions of the model is determined to locate regions of low complexity, that is to say low sensitivity of the output parameters to the input parameters. The input parameters may be ordered and the results displayed on view of a two dimensional surface starting with the first parameter and ending with the last. The display may represent the value of the output parameter by the length of a bar on the relevant part of the two dimensional surface. A combination of automatic parameter ordering and/or user input may be used to locate suitable regions.