Before revision: It combines the traditional intuition of classical control methods with H-infinity optimization techniques to achieve controllers whose stability and performance properties hold good in spite of small differences between the nominal plant assumed in design and the true plant encountered in practice.
After revision: It combines the traditional intuition of classical control methods with H-infinity optimization techniques to achieve controllers whose stability and performance properties hold good in spite of bounded differences between the nominal plant assumed in design and the true plant encountered in practice.