Sensitivity Level
If the total sensitivity of a nominal parameter is smaller the this user defined sensitivity level, the design parameter will be ignored. That means, its value will get fix for the optimization process. Furthermore, if the difference between total effect and main effect of all sensitivities for all nominal parameters is smaller then this sensitivity level, the interaction between design parameters will be also negligible. These lead to a reduced number of model calculations after the first approximation loop.
The sensitivity level must be between 0% and 100%. If it is 0%, all nominal parameters will be always considered. If it is 100%, no any nominal parameter will be considered for the optimization.