Internal ys external threat Systems · nterna a System normally well defined a Logic relatively static a Simple Roc approach valid 日 Examples(O‖ Pressure,Fire,Fuel,…, · External O External environment may not be well defined ◆ Stochastic elements Controlled system trajectory may be important ◆ Human response a Need roc like approach which considers entire system a System Operating Characteristic (Soc )approach of Kuchar 日 Examples( Traffic. Terrain, Weather,…)System Supervisory Control Computer Interface Display Control Sensors Direct Observation Internal vs External Threat Systems y Internal † System normally well defined † Logic relatively static † Simple ROC approach valid † Examples (Oil Pressure, Fire, Fuel, ...) y External † External environment may not be well defined ‹ Stochastic elements † Controlled system trajectory may be important ‹ Human response † Need ROC like approach which considers entire system † System Operating Characteristic (SOC) approach of Kuchar † Examples (Traffic, Terrain, Weather, …)