pBy next spring, two of three credit reporting bureaus will use a new model. Fair Isaac, the developer of FICO scores, has made the biggest change to its mathematical credit score model since it was introduced in 1989. Scores will still be on a 300- to 850-point scale. But the company estimates that 40% to 50% of borrowers’ scores could go up or down by more than 20 points because of how the new model fine-tunes the variables it uses to evaluate consumers’ credit use behavior./p