The Failure Steps pane is used to define steps that should be executed when a step in the build fails.  Multiple failure steps can be defined, and each step can be configured to build all or a certain set of failure steps upon failure.  Information about the failed step is available in the FailedStep object and the FAIL_STEP_STATUS and FAIL_STEP_OUTPUT system macros.  If a failure step fails and is not marked to continue, the build stops without processing any more failure steps.