These are the factors that determined the Credit Rating.

1.) Payments history: This is one of the most important factors which determined the credit score. Any statement which says about a late payment of more than 30 days  will reduce the credit scores drastically.

2.) Controls of debt:: Lenders want to see that the borrowers do not take more than what they can afford. Please do not keep more number of credit cards.

3.) Signs of Responsibility and Sensibility: This is what every lender wants to see finally. The score will obviously be very less if the borrower shows any signs of irresponsibility towards paying back his old dues.

4.) Re Aging: This is an action taken to change the credit score drastically. Here the date of last action is changed, especially if the last action caused some damage in the score.

5.) Credit Inquires:  Any inquiry made towards that borrowers is noted down immediately. This actually does not alter the credit score at all. But a complete record of all the inquiries  is also maintained.