Exhibit 18 November 10, 1995 Mr. Peter F. Murphy Vice President and Corporate Controller R.R. Donnelley & Sons Company 77 West Wacker Drive Chicago, IL 60601 Re: Form 10-Q Report for the quarter ended September 30, 1995. Dear Mr. Murphy: This letter is written to meet the requirements of Regulation S-K calling for a letter from a registrant's independent accountants whenever there has been a change in accounting principle or practice. We have been informed that, effective January 1, 1995, the Company changed from the double extension-component of cost method of accounting for LIFO inventories to the external index LIFO method using a composite of applicable producer price indices. According to the management of the Company, this change was made to better measure operating results by reflecting the effect of productivity improvements in the Company's cost of sales. A complete coordinated set of financial and reporting standards for determining the preferability of accounting principles among acceptable alternative principles has not been established by the accounting profession. Thus, we cannot make an objective determination of whether the change in accounting described in the preceding paragraph is to a preferable method. However, we have reviewed the pertinent factors, including those related to financial reporting, in this particular case on a subjective basis, and our opinion stated below is based on our determination made in this manner. We are of the opinion that the Company's change in method of accounting is to an acceptable alternative method of accounting, which, based upon the reasons stated for the change and our discussions with you, is also preferable under the circumstances in this particular case. In arriving at this opinion, we have relied on the business judgment and business planning of your management. We have not audited the application of this change to the financial statements of any period subsequent to December 31, 1994. Further, we have not examined and do not express any opinion with respect to your financial statements for the nine months ended September 30, 1995. Very truly yours, Arthur Andersen LLP