In a paper that was released yesterday; the Fed told banks participating in regular "street test" that they had flaws in their capital planning process, such as showing they were prepared and had already considered all risks their businesses face. Stress tests are used as a key tool for regulators to keep up with the health of the financial system especially after the 2007-2009 crash. The test are used to determine whether the big banks are keeping an adequate about of cash by testing how they would survive a hypothetical market shock.This reminds of me when banks in Europe were told to raise the amount of cash they keep in their indivdual bank vaults.