Credit scoring models are complex and often vary among creditors and for different types of credit. If one factor changes, your score may change -- but improvement generally depends on how that factor relates to other factors considered by the model. Only the creditor can explain what might improve your score under the particular model used to evaluate your credit application.
Nevertheless, scoring models generally evaluate the following types of information in your credit report:
Scoring models may be based on more than just information in your credit report. For example, the model may consider information from your credit application as well: your job or occupation, length of employment, or whether you own a home.
To improve your credit score under most models, concentrate on paying your bills on time, paying down outstanding balances, and not taking on new debt. It's likely to take some time to improve your score significantly.