A new method is presented for designing robust stabilizing controllers for SISO plants with any bounded parameter and/or degree variations in some known ranges It is shown that, if the plants are of minimum phase and have (any) fixed relative degrees and gains with fixed sign, then, linear time-invariant controllers can always be designed to stabilize robustly such plants. The order of a controller designed by this method is equal to the relative degree of the plant, and is independent of the order of the plant.