Mlesd Utility Function Shapes 16888 E5077 Monotonic Strictly Concave Increasing Concave Convex Non-monotonic decreasing Convex Cook Smaller-is-better(SIB) Nominal-is Range Larger-is-better(LIB) -better(NIB) -is-better(RIB Messac. Class 1S Class 3s Class 4S Class 2S o Massachusetts Institute of Technology -Prof de Weck and Prof. Willcox Engineering Systems Division and Dept of Aeronautics and Astronautics10 © Massachusetts Institute of Technology - Prof. de Weck and Prof. Willcox Engineering Systems Division and Dept. of Aeronautics and Astronautics Utility Function Shapes Utility Function Shapes Ji Ui Ji Ui Ui Ji Ui Monotonic Ji increasing decreasing Strictly Concave Convex Concave Convex Non-monotonic Cook: Smaller-is-better (SIB) Larger-is-better (LIB) Nominal-is -better (NIB) Range -is-better (RIB) - Messac: Class 1S Class 2S Class 3S Class 4S