BANK ONE AND ADMINISTAFF TO PROVIDE CUSTOMIZED ONLINE FINANCIAL CENTER TO ADMINISTAFF’S CLIENTS AND WORKSITE EMPLOYEES

CHICAGO and HOUSTON – April 12, 2000 – Bank One Corporation (NYSE: ONE), one of the nation’s leading providers of financial services, and Administaff, Inc. (NYSE: ASF), a leading Professional Employer Organization (PEO), today announced that Bank One will provide a customized, full-service online financial center to Administaff client companies and worksite employees.

Through the new online banking feature, more than 3,000 Administaff clients and 50,000 worksite employees will be able to open accounts, view transaction records, apply for loans and credit cards, invest, use tools and calculators to aid in financial planning decisions, pay bills, and receive special offerings.

The Bank One Financial Center with Administaff, the first online financial center created by Bank One for a company, is being launched as part of Administaff’s new eCommerce portal. The portal will be accessible to Administaff clients and worksite employees via the company’s web site (www.administaff.com) and through Administaff Assistant, which provides online human resource services to clients and employees.

"This new virtual banking center with Administaff is an important step in our quest to popularize online banking," said Bruce Luecke, president of Interactive Delivery Services for the Bank One Retail Group. "It represents our first agreement to provide online financial services directly through a corporate website, and we believe it will evolve into an important new avenue of expansion for Bank One."

Paul J. Sarvadi, Administaff’s president and chief executive officer, said, "This alliance with Bank One represents a significant addition to our eBusiness initiatives and our best-of-class provider network. In addition to further expanding our financial services offering for the benefit of our clients and worksite employees, we anticipate receiving incremental revenues from this alliance."

Administaff representatives estimate that about 80 percent of the company’s worksite employees live within Bank One’s 14-state market. In many of these states, Bank One is the market leader in financial services and one of the leading providers of loans to small businesses.

About Bank One

Bank One Corporation, headquartered in Chicago, is the nation’s fourth largest bank holding company, with assets of more than $260 billion. Bank One offers a full range of financial services to commercial and business customers and consumers. The company is the world’s largest issuer of Visa cards, one of the top 25 managers of mutual funds and a major national automotive lender. Bank One operates more than 1,800 banking centers and a nationwide network of ATMs. Bank One is a major commercial bank in the United States and in selected international markets.

Administaff eCommerce Portal

Administaff’s new business-to-business eCommerce portal represents a major element in the company’s comprehensive eBusiness strategy. Designed for exclusive use by Administaff’s clients and worksite employees, the portal will leverage Administaff’s buying power and business relationships to bring a broad range of value-added products and services from best-of-class providers to the premium small business community represented by Administaff’s client base. Additionally, the portal is expected to enhance the company’s attractiveness to prospective clients, further strengthen client retention rates, and produce incremental revenue streams. Administaff expects to unveil the new portal in April 2000. In addition to Bank One,

Administaff has strategic alliances with leading companies including American Express, Dell, IBM, Aon Enterprise Insurance Services, Forrester Research, MobShop, Inc. (formerly Accompany, Inc.) and Works.com.

About Administaff

With 1999 revenues of $2.3 billion, Administaff is a leading provider of personnel management services for small and medium-sized businesses throughout the United States. The company’s comprehensive Personnel Management System includes employment administration, benefits management, government compliance, recruiting and selection, employer liability management, training and development, performance management and owner support. Administaff ranks number 615 on the Fortune 1000 list and is included for the second consecutive year on Fortune magazine's list of "America's Most Admired Companies." The company also ranks number 83 on the InformationWeek 500 list of leading information technology innovators. Administaff currently has 26 sales offices in 15 major markets. For additional information, visit the company's web site at www.administaff.com.

(Note: The statements contained in this press release that are not historical facts are forward-looking statements that involve a number of risks and uncertainties. Therefore, the actual results of future events described in such forward-looking statements could differ materially from those stated in such forward-looking statements. Among the factors that could cause actual results to differ materially are: (i) regulatory and tax developments; (ii) changes in Administaff’s direct costs and operating expenses; (iii) the effectiveness of Administaff’s sales and marketing efforts, including its marketing agreement with American Express, American Express’ ability to set qualified appointments and Administaff’s ability to convert those appointments into sales; (iv) the estimated costs and effectiveness of capital projects and investments in technology and infrastructure; (v) Administaff’s ability to effectively implement its eBusiness strategy, including identifying and reaching agreements with strategic alliance partners, timely rollout of and attraction of clients and worksite employees to its eCommerce portal, effective generation of revenues from eBusiness initiatives and unanticipated development costs of eBusiness initiatives; and (vi) changes in the competitive environments in the PEO industry. These factors are described in further detail in Administaff’s filings with the Securities and Exchange Commission.)