ADMINISTAFF NAMED ONE OF THE LEADING INNOVATORS ON THE INFORMATIONWEEK 500 LIST

Company ranks third in Professional Services category

HOUSTON – October 13, 1999 – Administaff, Inc. (NYSE: ASF), a leading Professional Employer Organization (PEO), has been named to the InformationWeek 500 list of Leading Information Technology Innovators. Administaff ranked third in the Professional Services category and was listed number 83 overall. This is the second consecutive year Administaff has been ranked on the 500 list. This year’s list is published in the magazine’s Sept. 27, 1999, issue.

In compiling the list, InformationWeek selected 500 companies with more than $1 billion in annual revenues that demonstrated technological, procedural and organizational innovation. In addition, the companies were ranked based on their early adoption and creative use of technologies that made significant contributions to their organizations. Administaff received gold citations in the categories of e-business and customer-relationship management. For more information, visit the publication’s web site at www.informationweek.com.

"Administaff is aggressively developing its e-service capability as a key component in our ‘high tech, high touch’ approach to service delivery," said Paul J. Sarvadi, Administaff president and chief executive officer. "We are very pleased that InformationWeek has recognized our ongoing program to further expand and improve our technology infrastructure."

Administaff provides small and medium-sized businesses with a comprehensive Personnel Management System that includes benefits and payroll administration, medical and workers’ compensation insurance programs, personnel records management, employer liability

management, employee recruiting and selection, performance management, and training and development services. The company currently has 25 offices in 15 major markets and serves clients and worksite employees throughout the United States. 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 the company’s direct costs and operating expenses; (iii) the effectiveness of the company’s sales and marketing efforts, including its marketing agreement with American Express, American Express’ ability to set qualified appointments and the company’s ability to convert those appointments into sales; (iv) the estimated costs and effectiveness of capital projects and investments in technology and infrastructure; (v) changes in the competitive environments in the PEO industry; and (vi) the effectiveness and estimated costs of the company’s Year 2000 conversion and contingency plans. These factors are described in further detail in the company’s filings with the Securities and Exchange Commission.)