Macroeconomic stress testing is an exercise that is driven by central banks and regulators. Scenarios on key risk parameters are developed then handed over to these banks. They then run these scenarios on their own portfolios to better understand the inherent risks and their capital requirements for exercises and regulatory requirements such as CCAR. The process has a number of key steps including: downloading data, designing and analyzing risk scenarios, building and validating macroeconomic models, and pricing of portfolios.