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In the above-named article [ibid., vol. 16, pp. 920??935, Oct. 1998] there is an error in the experimental results reported for the Hou 3&4 (clustered) benchmark, due to a typographical error in its task collection input file. The last line of the The Hou 3&4 (clustered) row of Table IV on page 932 of the original article should be replaced with Table I of this short paper. For this example, average price increases when the effort level is changed from three to four. In general, solution quality increases, i.e., the price decreases, with increasing optimizer effort. This trend is not expressed in this case as a result of the limited number of samples (30). When run with 500 samples, price strictly decreases with increasing effort. The Hou 3&4 (clustered) row of Table VI on page 933 of the above paper1 should be replaced with Table II of this short paper.