Letters to the Editor. Recent HBR articles generate com-ments from Alfred C. DeCrane, Jr., Frank P. Popoff, Edgar S. Woo lard, Jr., Step Han Schmidheiny, David M. Gute, Ulrich Steger, Ralph Earle III, Paul R. Portney, Christopher M. Cimarusti, Robert J. Saldich, and Jack W. Shilling.