The paper presents a simple method for the design of proportional-plus-integral controllers for multivariable systems where the controllers act directly on the available system outputs. For anm-inputl-output system of ordern, the PI controller can place 2m+l− 1 poles of the (n+l)th-order closed-loop system at any desired locations. In the closed-loop system the outputs follow step commands in the steady state and reject unmeasurable arbitrary disturbances with constant final values. The steady-state properties are preserved for variations or uncertainties in the system parameters provided the closed-loop stability is maintained. The transient responses of the closed-loop system may be improved by tuning the controller as described in the paper. The method is applied to the design of a PI controller for a gas-turbine.