A numerical method of ranking the creditworthiness of individuals, companies, and governments. Each credit bureau has its own ranking system and scoring method. Some credit bureaus target only individuals, others target businesses. Corporations that issue debt and other obligations are scored by credit rating agencies such as Standard & PoorÂ’s, MoodyÂ’s Investors Service, Fitch Ratings, and D&B Corporation (formally known as Dun & Bradstreet Corporation).