**Bernd Heinen, JMP Systems Engineer, SAS**

**James S. Dailey, PhD, Global Technical Key Account Manager, BASF **

Sometimes the result of an experiment is not just a set of measurements; it is a curve. How can the optimal mixture be derived if a set of curves needs to be compared? In this situation many experimenters tend to choose a somehow representative X-value and use the associated Y-value as the outcome of the experiment. Thus they ignore a wide set of valuable information. The solution here is to understand what the optimal curve is, to fit a parameterized curve for each experiment, to interpret the parameters as the outcome of the individual experiments and to optimize the mixture with respect to those parameters. The analytical process uses Graph Builder, the Nonlinear platform and Fit Model to exploit all available information and to find the optimal result. The whole solution is motivated and demonstrated with data from a chemical mixture optimization problem.