An SMS needs a feedback loop! The data from that feedback loop needs to be VERIFIED and VALIDATED as accurate BEFORE it is used to make decisions within the SMS.
Just imagine driving your vehicle with NO FEEDBACK. No speedometer, no engine temp, no blinker feedback, no RPMs, NOTHING. You’re just driving, maybe relying on others around you to gauge your speed.
Far too many safety efforts have only ONE metric: OSHA recordables. These look backward; they indicate when the SMS has failed.