Standard & Poor’s said it will rotate analysts through different assignments and may tie their compensation to ratings performance as it seeks to restore confidence in their system of grading borrowers.

“While the vast majority of the $32 trillion of securities that S&P rates performed as anticipated, the performance of our ratings in the area of residential mortgage-related securities was a major disappointment,” Deven Sharma, president of the McGraw-Hill Cos. unit, said in a statement. “This is something that we at S&P deeply regret.”

New York-based S&P, the world’s largest credit-ranking company, also will review past ratings of employees who leave the company to work for an issuer, Sharma said.