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The research is an attempt to study the credit scoring methodology adopted by commercial banks in (Chennai) India. The study has focused on main personal finance products of commercial bank i.e. Home loan, Personal Loan and Vehicle Loan. The aim of this study is to highlight the factors affecting the internal and external credit scoring methods followed by the commercial banks and to consolidate the factors considered while scoring the personal finance application form. A qualitative research strategy, case study has been adopted as appropriate for this particular research area. The primary data has been collected through interview schedules and secondary sources from the newspaper, images and video interviews of bankers as well as credit bureaus employees. All the data sources have been analyzed using the new qualitative software known as QSR NVivo. It has been found that the factors which has effect on the credit information report and in turn on credit scores are payment history, high utilization of credit, higher percentage of personal loans and many new accounts opened recently.