In a terse response to the suggestion that Fair Isaac Corp. consider a sale, Mark N. Greene, the company's chief executive, told an activist shareholder that its board "takes its oversight obligations seriously."

Thomas E. Sandell, the CEO of Sandell Asset Management Corp., had argued in a letter last week that turnarounds of the sort Fair Isaac is attempting "may best be undertaken as a part of a larger organization or in a private ownership context."

The Fair Isaac board should measure the company's progress according to "concrete benchmarks and milestones" and change course quickly if its performance does not improve, Mr. Sandell wrote.

In his three-sentence response Tuesday, Mr. Greene wrote that the board "regularly assesses, and closely monitors" the Minneapolis credit-scoring company's "performance, strategic direction, and alternatives."

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