SAN DIEGO — Sears, Roebuck and Co. has chosen an Internet fraud detection system from HNC Software Inc. Known as eFalcon, the technology uses predictive software to examine transaction, customer, and merchant data in real time to help online merchants prevent payment fraud.

Media Metrix Inc. said that Sears’ Web sites have the most visitors in the department store retail category. The sites attracted nearly 2.5 million visitors last July.

“With the growing number of people shopping at sears.com, we determined that our best choice is a real-time fraud detection system designed specifically for online businesses,” said Ed Barclay, Sears’ vice president for asset protection.

Sears already uses HNC’s Falcon retail fraud detection system to protect the credit accounts of 60 million customers.

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