What is credit score (Fico score)? A FICO score is a credit score developed by Fair Isaac & Co. Credit scoring is a method of determining the likelihood that credit users will pay their bills. Fair, Isaac began its pioneering work with credit scoring in the late 1950s and, since then, scoring has become widely accepted by lenders as a reliable means of credit evaluation. Fair, Isaac & Co. and the credit bureaus do not reveal how these scores are computed.Yes.