EXHIBIT 13 (iii) Report of Independent Accountants on Financial Statement Schedule To the Board of Directors of Stone & Webster, Incorporated: Our audits of the consolidated financial statements referred to in our report dated February 12, 1999 appearing in the 1998 Annual Report to Shareholders of Stone & Webster, Incorporated (which report and consolidated financial statements are incorporated by reference in this Annual Report on Form 10-K) also included an audit of the financial statement schedule listed in Item 14(a)(1)(ii) of this Form 10-K. In our opinion, the financial statement schedule presents fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. /s/ PricewaterhouseCoopers LLP Boston, Massachusetts February 12, 1999