Software reliability

LT CDR PABITRA KUMAR PANDA M TECH (RE), IIT KGP 11 AUG 2010 SOFTWARE RELIABILITY

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SCOPE OF PRESENTATION

SOFTWARE RELIABILITY ,[object Object],[object Object],[object Object],[object Object],[object Object]

SOFTWARE REL I AB I L I TY CONTD . ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is Software Reliability ,[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Software reliability

HARD WARE VS SOFTWARE HAZARD RATE

SOFTWARE FA I LURE MECHAN I SM ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],FAILURES AND FAULTS

FAILURE CLASSIFICATION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Measuring Software Reliability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SOFTWARE FA I LURE MECHAN I SM

AVERAGE FAILURE RATE OF A MS PRODUCT

REASONS FOR THIS PHENOMENON ,[object Object],[object Object],[object Object],[object Object],[object Object]

Measuring Software Reliability ,[object Object],[object Object],[object Object]

MEASUR I NG SOFTWARE REL I AB I L I TY ,[object Object],[object Object],[object Object]

SOFTWARE REL I AB I L I TY MODELS ,[object Object],[object Object],[object Object],[object Object]

SOFTWARE REL I AB I L I TY MODELS ISSUES PREDICTION MODELS ESTIMATION MODELS DATA REFERENCE Uses historical data Uses data from the current software development effort WHEN USED IN DEVELOPMENT CYCLE Usually made prior to development or test phases; can be used as early as concept phase Usually made later in life cycle(after some data have been collected); not typically used in concept or development phases TIME FRAME Predict reliability at some future time Estimate reliability at either present or some future time

SOFTWARE REL I AB I L I TY MODELS ,[object Object],[object Object],[object Object],[object Object],[object Object]

SOFTWARE REL I AB I L I TY MODELS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SOFTWARE REL I AB I L I TY MODELS ,[object Object],[object Object],[object Object]

RANDOM-STEP RELIABILITY GROWTH

MUSA’S MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

MUSA’S BASIC MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

EXAMPLE ,[object Object],[object Object],[object Object]

MUSA/OKUMOTO LOGARITHMIC MODEL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Model Extension (1) ,[object Object],[object Object],[object Object]

Example 3 (Basic Model) ,[object Object],[object Object],[object Object],[object Object]

Example 4 (Logarithmic Model) ,[object Object],[object Object],[object Object],[object Object],(63 in basic model) (100 in basic model)

Model Extension (2) ,[object Object],[object Object],[object Object]

Example 5 (Basic Model) ,[object Object],[object Object],[object Object],[object Object]

Example 6 (Logarithmic Model) ,[object Object],[object Object],[object Object],(3.68 in basic model) (0.000454 in basic model)

MODEL DISCUSSION ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

APPL I CAB I L I TY OF SOFTWARE REL I AB I L I TY MODELS ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],STATISTICAL TESTING

STAT I ST I CAL TEST I NG ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],STATISTICAL TESTING PROCEDURE

STATISTICAL TESTING DIFFICULTIES ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BANK AUTO-TELLER SYSTEM ,[object Object],[object Object],[object Object],[object Object],[object Object]

EXAMPLES OF A RELIABILITY SPEC.

SPECIFICATION VALIDATION ,[object Object],[object Object],[object Object],[object Object]

COSTS OF INCREASING RELIABILITY

CONCLUS I ONS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

REFERENCES ,[object Object],[object Object],[object Object],[object Object],[object Object]

Software reliability

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