This paper first finds that the high frequency (omega) periodic controller suggested in Lee, Meerkov, and Runolfsson (1987) for fixed mode removal, and pole and zero placement, of a class of decentralized systems (A, B-i,B- C-i) all the strongly interconnected channels of which satisfy CiBi = 0. causes large, O(omega). oscillations in the outputs. Next it proposes an alternative controller, a dual of the above, that achieves the compensation with oscillations of O(1) only. 2010 Elsevier Ltd. All rights reserved.