A In the crisis a lot of banks failed, in part because they did not have big enough capital buffers to absorb their losses. This test will see if they have increased those buffers enough.
Q Will it work?
A Tests have been done before, but the national authorities used different methods and made it easy for weak banks to pass the test. This is meant to be a more uniform.
Q What happens if a bank fails?
A Then they will be forced to raise more capital. If they cannot do that in the market, they may need help from governments – which will be expensive.