A procedure is presented for the synthesis of multi-input multi-output linear time-invariant control systems using output feedback and if necessary a dynamic device. This additional dynamic part has the structure of a reduced order observer, but its order and parameters are determined rather to achieve a resultant closed-loop transfer matrix than to produce an estimate for unaccessible state variables or for linear functions of state variables. The given method allows in a simple manner for incorporation of additional design specifications relating to control effort and sensitivity properties.