OLeveson-16 Reliability Engineering Approach to Safety(2) Assumes accidents are the result of component failure t Techniques exist to increase component reliability Failure rates in hardware are quantifiable Omits important factors in accidents May even decrease safety Many accidents occur without any component" failure e.g. Accidents may be caused by equipment operation outside parameters and time limits upon which reliability analyses are based Or may be caused by interactions of components all operating according to specification Highly reliable components are not necessarily safec ✌✵✄☎✍✲✄☎✏✎✠☎✑✝✒✶✓✭✷ ✮✛☎✯✄☎✚✰✜✍✎✏✎✱☎✣✴✄☎☛ ✤✛☎✡☎✤ ☛✤✚✰ Reliability Engineering Approach to Safety (2) Assumes accidents are the result of component failure. Techniques exist to increase component reliability Failure rates in hardware are quantifiable. Omits important factors in accidents. May even decrease safety. Many accidents occur without any component ‘‘failure’’ e.g. Accidents may be caused by equipment operation outside parameters and time limits upon which reliability analyses are based. Or may be caused by interactions of components all operating according to specification Highly reliable components are not necessarily safe