The level, structure and nature of problem loans are a significant source of credit risk in the banking business, with the main reason for developing and increasing problem loans indicate the need for a comprehensive and strategic approach to solving them. In addition, the accumulation of problem loans in banks' balance sheets negatively affects the credit activity of banks and, consequently has a negative impact on economic activity, primarily due to reduced availability of possible sources of financing both for companies and for the population. One of the main reasons for the increased credit risk exposure of banks, especially before the outbreak of the subprime crisis, are less developed models for evaluation and measurement of credit ri...