Brasilian Bank to Control Money Laundering With Risk Management Solution From ACI Worldwide.

OMAHA, Neb.--(BUSINESS WIRE)--Sept. 16, 1999--

Banco Itau Chooses PRISM to Fight Fraud Involving Money Laundering 

ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise electronic payments solutions, announces the licensing of its PRISM(R) fraud management system to Banco Itau S.A., the second largest bank in Brazil. Banco Itau will use PRISM to monitor and control fraud involving money laundering.

PRISM offers an advanced neural net-based fraud detection system that identifies subtle patterns of fraudulent behavior by comparing individual card and account usage with known patterns of fraud. Transactions are monitored in near real-time or batch environments and when a suspicious transaction is found, the transaction is flagged for prompt and appropriate action. PRISM's ability to recognize fraudulent activity and learn from experience provides a proactive method to reduce losses from fraud.

Banco Itau will use PRISM to meet money-laundering mandates established by the Central Bank of Brazil. PRISM will monitor "universal accounts"--accounts that tie together the various bank accounts to which individuals and businesses have access--to detect and alert bank officials to possible money laundering activity. A graphical interface enables officials to review alerts and take appropriate action.

"PRISM will help us meet the Central Bank's money laundering rules while limiting our exposure to fraud," said Mr. Vilson Gomes de Brito, managing director of Banco Itau. "We can monitor activity and shut down fraudulent activity before it multiplies."

"PRISM provides Banco Itau with a technologically advanced and cost effective way to perform scoring and review of its account transactions," said Dave Russell, president of ACI Worldwide. "The neural network system offers a major improvement over rule-based systems and statistical score cards and gives the bank early, accurate and adaptive fraud detection."

PRISM includes patented technology provided by Nestor, Inc. (OTC: NEST) and is supported and distributed around the globe by ACI Worldwide.

ACI Worldwide (Nasdaq: TSAI) is helping customers change the way the world works with software products developed for consumer banking, corporate banking, retail and system solutions. The company maintains operations in the Americas, Europe/Middle East/Africa and Asia/Pacific and is a leading international provider of software for electronic commerce and electronic payments. ACI Worldwide distributed solutions are used by more than 2,100 customers in 76 countries. Visit ACI Worldwide on the Internet at www.aciworldwide.com.

This press release contains forward-looking statements made pursuant to the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. You are cautioned that such forward-looking statements are not guarantees of future performance and involve risks and uncertainties that could significantly affect expected results in the future from those expressed in any such forward-looking statements made by, or on behalf of the company. Certain factors that could cause actual results to differ materially are contained in Exhibit 99.01 of the Transaction Systems Architects, Inc. Annual Report on form 10-K.