Ron Ross: “In state-based evaluation of rules, current states of affairs are captured and monitored in real-time by a ‘watcher’ external to processes. This ‘watcher’ automatically intervenes whenever a violation of a rule occurs. The watcher resets the activity – i.e., the state of affairs is corrected if possible, some sanction(s) are perhaps issued, messages are possibly sent, procedures may be invoked, etc. By this means errors are corrected automatically and ASAP, so they don’t compound themselves downstream.” Link