These slides are designed to accompany Software Engineering: A Practitioner¡¯s Approach, 7/e (McGraw-Hill 2009). Slides copyright 2009 by Roger Pressman.
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10
Software Reliability
nA simple measure of reliability is mean-time-between-failure (MTBF), where
n MTBF = MTTF + MTTR
nThe acronyms MTTF and MTTR are mean-time-to-failure and mean-time-to-repair, respectively.
nSoftware availability is the probability that a program is operating according to requirements at a given point in time and is defined as
n Availability = [MTTF/(MTTF + MTTR)] x 100%