Given a number of completed experiments in an EVE, a response surface model can be constructed to represent the system's behavior analytically with - mostly polynomial - functions by fitting the polynomial coefficients to the data points [BD87]. The resulting coefficient values, together with information on the valid ranges for all controls and on the quality of the fit achieved, are stored as a response surface model for evaluation by the RSM evaluator (cf. Figure 8.9). In Section 8.10, glimpses of the GUI module for interactive exploration response surface models are shown.