The robustness refers to the ability of a control system to withstand parameter variations in the plant transfer function, and still maintain the stability and performance goals. The system sensitivit...The robustness refers to the ability of a control system to withstand parameter variations in the plant transfer function, and still maintain the stability and performance goals. The system sensitivity function is defined as the ratio of percentage change in the closed-loop transfer function to percentage change in the plant transfer function, i.e., assuming unity feedback (\(H(s)=1\)),
