1. A computer implemented method for fault handling in a IT environment having a workflow runtime environment that executes at least one workflow application interacting with at least one application by using interface information about the at least one application, the computer implemented method comprising: in response to receiving a first instance of a fault response from the at least one application, a fault handler performing a first lookup of a fault handling policy corresponding to the fault response within a fault handling descriptions catalogue of an externalized storage repository, wherein the corresponding fault handling policy points to a first one or more fault handling descriptions; the fault handler loading the first one or more fault handling descriptions and using the first one or more fault handling descriptions to continue execution of the at least one workflow application; in response to receiving a second instance of the fault response from the at least one application, the fault handler performing a second lookup of the fault handling policy within the fault handling descriptions catalogue, wherein the fault handling policy has been updated within the fault handling descriptions catalogue, after the first lookup, to point to a second one or more fault handling descriptions; the fault handler loading the second one or more fault handling descriptions; and applying the second one or more fault handling descriptions to continue execution of the at least one workflow application.