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Definition of Reliability:

The capability of software to maintain a level of performance when used under specified conditions.

Applications

• A target and measurement in the maintenance phase
• Testing criteria

Models

There are 2 models, namely:
• Basic Reliability Model (BM)
• Logarithmic Poisson Reliablility Model (LPM)



- time, or time interval

- average number of failures at or in the interval

- average number of failures per unit of time at time

- decrease in failure intensity













	(BM)
	(LPM)

Failure intensity as a function of (Source: J.D. Musa, A. Iannino and K. Okumoto, Software Reliability, Copyright McGraw-Hill Book Company, 1987.)