Marriott Corp. has reorganized the structure of all three of its principal lines of business lodging, contract service and restaurants with new responsibilities for several senior executives.

"It's an opportunity to move further in the direction of grouping our businesses around the customers they serve," said J.W. Marriott Jr., chairman. "The new structure will improve our responsiveness to the marketplace and enable us to use our resources more effectively. The net result will be a stronger company with an even sharper customer focus."Marriott said Frederic V. Malek, executive vice president of Marriott Corp. and president of Marriott Hotels and Resorts, has requested and been granted a leave of absence to devote full time to his role as Vice President George Bush's convention director, responsible for all convention planning and activities relating to the Bush campaign.

Effective May 1, the company will be restructured into two principal operating groups Lodging, which will include all of Marriott's lodging products, and Service, which will encompass all contract service and restaurant businesses.

Francis W. Cash has been promoted to president, Marriott Service Group, and will remain an executive vice president of Marriott Corp. Cash, 46, is a 14-year veteran of Marriott Corp.

John H. Dasburg, 44, has been promoted to president, Marriott Lodging Group, and will remain an executive vice president of Marriott Corp. Dasburg has been with Marriott since 1980 and has been chief financial and real estate development officer since 1985.

Daniel J. Altobello has been promoted to president, Airport Operations, and will remain an executive vice president of Marriott Corp. Altobello, 47, will continue to be responsible for Host International (airport food, beverage and merchandise operations) and Marriott In-Flite Services (airline catering). He joined Marriott in 1979 and was named an executive vice president in 1985.

William J. Shaw, 42, has been promoted to chief financial officer and will be elected an executive vice president. In addition to the traditional financial functions, he will be responsible for Marriott's information systems division.

Founded in 1927, Washington-based Marriott Corp. has operations in 50 states and 24 countries.