A medium large bank in The Netherlands has asked Ectrix to assist with the re-development of its credit risk models for their retail mortgage portfolio. In scope are the LGD and PD models, which need to be re-developed such that they meet the IRB criteria. Also LGD-in-default, Downturn-LGD and ELBE are part of the assigned scope. Furthermore, as preparation for the development of the PD model, a data quality assessment is performed for the mortgage default dataset, which will be followed up by a data remediation phase. The project is split up in two phases in which two activities will be performed in parallel. The first phase focusses on the re-development of LGD and the data quality assesment, while the second phase will focus on the data remediation and subsequently the re-development of the PD model.