In this blog, the author explains the steps to a dual risk rating system. In such a system, the probability of default (PD) is estimated separately from the loss given default (LGD). The expected loss for a given loan is then calculated as their product. Five essential steps to a dual risk rating system are: Understanding the key drivers of a dual risk system; Demonstrating the advantages of a dual risk rating approach through case studies; Implementing separate PD and LGD credit scoring solutions; Developing a PD and LGD mapping scale; and lastly Combining dual rating scores. Read more at : http://marketintelligence.spglobal.com/blog/risk-insight-five-essential-steps-to-a-dual-risk-rating-system