How much dependability?
nHow
much do we have? It varies
oAs much as the market demands
▬Is
there evidence of market failure?
oAlmost any amount is possible
▬If
you restrict the aspirations
▬In
other words, there’s a tradeoff
nHow much do we need? It varies
oBut safety-critical apps are growing fast
oWhat’s the value of a life? Wild inconsistency
▬Look
at British railways
nDependable
vs. secure