Keller, Zanger, Bissell & Co., the Rockville-based public accounting firm with offices in Rockville, Washington and Frederick, acquired Ward & Hastings, P.C. of Gaithersburg for an undisclosed amount.

Keller, Zanger was interested in the smaller firm's expertise in the construction and automobile dealership industries, said managing partner Charlie Keller.

Keller said the acquisition of Ward & Hastings, which opened a year and a half ago and had seven employees, is part of Keller, Zanger's plan to increase the size of its Rockville and Washington offices. As part of that plan, the firm may eventually acquire more area accounting firms, Keller said.

Keller, Zanger, which now has 90 employees, is expecting its 1990 revenue to be about $6.5 million. Ward & Hastings' revenue last year was less than $1 million, Keller said.

American PsychManagement of Arlington, a subsidiary of Value Health Inc. of Avon, Conn., won a five-year contract from International Business Machines Corp. of Armonk, N.Y., to provide mental health care services for the company's 650,000 domestic beneficiaries.

Value Health said the program is believed to be the largest employer-sponsored managed mental health-care program in the country.

VSE Corp. of Alexandria acquired Schmoldt Engineering Services Co. of Bartlesville, Okla., which specializes in corrosion control and protection systems, for an undisclosed amount. Schmoldt, which had sales of about $1.5 million in the nine months ended March 31, 1990, will retain its name and become a subsidiary of VSE.

MCI Communications Corp. of Washington received a three-year, $13 million contract from Continental Corp. of New York to be Continental's primary telecommunications carrier.

Ferranti Healthcare Systems Corp. of Hunt Valley won a contract from Children's Hospital of Mountainside, N.J., to provide seven of its Leadership Series hospital information systems. Terms were not disclosed.

S. Laird Jenkins Corp. of Alexandria was awarded an advertising contract by American Computer Development Inc. of Germantown.

STN Computer Systems of Falls Church received a contract from the Supreme Court Opinion Network of Washington, a consortium of legal, publishing and news organizations, to design and develop a network for electronic access to court opinions.

MacVicar Design and Communications of Arlington won an advertising contract from the Loudoun County Department of Economic Development.

RMR Associates Inc. of Rockville received advertising and public relations contracts from Jewel & Company Inc. of Beltsville, a distributor of blank and screen-printed T-shirts and other sportswear, and the Software Group Ltd. of Woodbridge, Ontario.

Hughes Network Systems Inc. of Germantown received a contract worth more than $6 million from Phar-Mor Inc. of Youngstown, Ohio, to provide a satellite-based telecommunications system.

Innovative Aircourts Inc. of Washington was awarded a contract by the Montgomery College board of trustees for food and beverage services at three Montgomery College campuses. Terms of the agreement were not disclosed.

The American Society for Training and Development of Alexandria introduced Technical & Skills Training, a subscription-only magazine aimed at technical experts who are given management and training responsibility but have little or no background in that area.

Annapolis Associated Architects opened in Annapolis.

Capital Partnerships Inc. opened in Arlington and San Francisco.

Fey & Wingate Inc., a marketing firm, opened in Baltimore.

Business Filing Systems Inc. opened in Sterling.

Art of Moving Inc. of Bethesda changed its name to Art of Moving & Living Inc.

Manor Care Inc. of Silver Spring changed the name of its lodging franchise subsidiary, Quality Inns International Inc. to Choice Hotels International Inc.

Barrett Penan and James Scott opened Penan, Scott and Co., a public accounting firm, in Rockville.

Raxco Software Inc. of Rockville acquired a presentation graphics package from Multiware Inc. of Davis, Calif., for an undisclosed amount. The package can be used with the company's Raxmanager system-wide resource management system. Announcements of news and developments affecting Washington area companies should be sent to Regional Report, Business News Department, The Washington Post, 1150 15th St. NW, Washington, D.C. 20071.