Alliance & Leicester and ACI Worldwide Celebrate Twenty-Year Partnership.

Business Editors/High-Tech Writers

WATFORD, United Kingdom--(BUSINESS WIRE)--June 15, 2004

Since 1984 ACI has Delivered Payment Processing Support to

Alliance & Leicester and Today Supports the Bank's Risk

Management Strategy

ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise payment solutions, today celebrates a 20-year business partnership with Alliance & Leicester, the eighth largest bank in the UK. Since 1984, Alliance & Leicester has used ACI's BASE24(R) software to support transaction processing across growing customer channels. Today, the bank continues to use payment software from ACI along with expert risk management technology to manage its exposure to potential fraud.

In 1984, Girobank, later to become part of Alliance & Leicester, was the first EMEA customer to deploy BASE24 software. BASE24 has evolved with Alliance & Leicester and now supports the bank's network of over 2,500 ATMs. In 1984 initial transaction volumes were around 60 per day per ATM. Today, Alliance & Leicester experiences peak ATM traffic at 33 transactions per second, equating to over 1.2 million transactions per day. ACI's high performance software provides device driving, transaction routing and authorisation for every transaction across the bank's network.

Alliance & Leicester was also the first European customer to implement ACI Proactive Risk Manager(TM) to detect potentially fraudulent behaviour. The solution combines network scoring technology with rules-based strategies and advanced client/server workflow. It enables Alliance & Leicester to prevent and detect fraud quickly and effectively.

The bank also required a solution to look into the areas of account takeover, identity theft and compliance with anti-money laundering regulations. It wanted to proactively monitor transaction activity and identify unusual transactions early in their lifecycle to minimise risk exposure and costs. Alliance & Leicester launched a current account profiling project, part of a major 'Know Your Customer' anti-money laundering initiative that also took into account the bank's need for an enterprise view of risk management and compliance with government regulation. To support this vision, the bank began using ACI's anti-money laundering and debit and credit card fraud detection software as the underpinning technology. With these solutions in place, Alliance & Leicester has further improved its fraud prevention strategy and achieved significant cost savings and benefits.

"With technological expertise from solution providers like ACI Worldwide, Alliance & Leicester has been very successful in the UK market," said Peter Duffell, head of business systems delivery, Alliance & Leicester. "We are well-placed to benefit from the advantages that BASE24 offers our business and have increased confidence in the legitimacy of transaction approval, thus enabling us to focus more resource on high risk activity. We look forward to the continued success of our relationship with ACI."

"Our 20 year partnership with Alliance & Leicester marks an important milestone in the evolution of our business," said Richard Launder, managing director for ACI Worldwide in EMEA. "We have supported the bank throughout its own progression and contributed to the forward-thinking financial organisation it is today. Alliance & Leicester has also played a significant role in the advancement of our products and their uptake across EMEA. We are delighted to celebrate our relationship and look to the future for another 20 years of success."

Executives from both Alliance & Leicester and ACI celebrated the partnership last night at an executive dinner at Kilworth House in Leicestershire. Mark Vipond, president of ACI Worldwide and Russell Simm, director, technology & process design, Alliance & Leicester marked the occasion with a donation to the UK's National Society for the Prevention of Cruelty to Children (NSPCC) FULL STOP Campaign, a charity supported closely by Alliance & Leicester.

About Alliance & Leicester

Alliance & Leicester is one of the UK's major financial services groups. It offers a broad range of financial services to personal, commercial and small business customers. Alliance & Leicester has been a member of the FTSE 100 index of leading shares since converting from its original mutual building society status in 1997.

Alliance & Leicester employs over 9,000 people in over 300 locations serving 5.5 million customers and is dedicated to providing financial products that give genuine value for money. Visit Alliance & Leicester on the Internet at www.alliance-leicester.com

About ACI Worldwide

Every second of every day, consumers are initiating electronic payment transactions--getting cash at ATMs, using debit and credit cards to make purchases in stores and on the Internet, banking by phone and PC, and paying bills online. Over 40 billion times a year, ACI software is used to process these transactions, powering the world's online payment systems. ACI was founded in 1975 and pioneered the development of applications and networking software for online transaction processing. Today more than 500 customers in 75 countries use ACI supplied software. Visit ACI Worldwide on the Internet at www.aciworldwide.com

Any statements in this press release regarding projected results are preliminary and "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, this press release may contain other forward-looking statements including statements regarding Transaction Systems Architects, Inc.'s ("TSA"), its subsidiaries or third parties' expectations, predictions, views, opportunities, plans, strategies, beliefs, and statements of similar effect. The forward-looking statements in this press release are subject to a variety of risks and uncertainties. Actual results could differ materially.

For a detailed discussion of these and other risk factors, interested parties should review the Company's filings with the Securities and Exchange Commission, including the Company's Form 10-Q filed on August 14, 2003, the Company's Form 10-K filed on December 23, 2003, the Company's Form 10-Q filed on February 17, 2004, and the Company's Form 10-Q filed on May 17, 2004.