Copyright 2007 Koren & Krishna, Morgan-Kaufman Part.1.23 Another Measure - Performability  Another approach - consider everything from the perspective of the application  Application is used to define ''accomplishment levels L 1, L 2,...,L n  Each represents a level of quality of service delivered by the application  Example: L i indicates i system crashes during the mission time period T  Performability is a vector (P(L 1 ),P(L 2 ),...,P(L n )) where P(L i ) is the probability that the computer functions well enough to permit the application to reach up to accomplishment level L i
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