Subsystem Hazard Analysis(SSHA tem Hazard Analysis EXamine subsystems to determine how their Normal performance Operational degradation Functional failure Unintended function Inadvertent function(proper function but at wrong time or in wrong order) could contribute to system hazards Determine how to satisfy design constraints in subsystem design Validate the subsystem design satisfies safety design constraints and does not introduce previously unidentified hazardous system behavior OL Software Hazard Analysis A form of subsystem hazard analysis Validate that specified software blackbox behavior satisfies system safety design constraints Check specified software behavior satisfies general software system safety design criteria Must perform on ALL software, including COTSc ✢✡☎✣✞✡☎✆✟✙✤✕✔✥✧✦✩★✪✦ ￾✂✁☎✄☎✆✞✝✟✆✞✠✡☎☛✌☞✎✍☎✏✟✍☎✑✒✔✓✖✕☎✍☎✗✝✞✆✟✘✆ Subsystem Hazard Analysis (SSHA) Examine subsystems to determine how their Normal performance Operational degradation Functional failure Unintended function Inadvertent function (proper function but at wrong time or in wrong order) could contribute to system hazards. Determine how to satisfy design constraints in subsystem design. Validate the subsystem design satisfies safety design constraints and does not introduce previously unidentified hazardous system behavior. c ✢✡☎✣✞✡☎✆✟✙✤✕✔✥✧✦✩★☎✫ ￾✂✙☎✚✠✛✜✍☎✑✡✔☞✎✍☎✏✞✍☎✑✒✔✓✖✕☎✍☎✗✝✞✆✞✘✆ Software Hazard Analysis A form of subsystem hazard analysis. Validate that specified software blackbox behavior satisfies system safety design constraints. Check specified software behavior satisfies general software system safety design criteria. Must perform on ALL software, including COTS