Reliability growth models for quality management

Software Quality Management
Unit
U – IV

Roy Antony Arnold G
y y
Asst. Prof. / CSE

• Alth h reliability growth models are meant
Although li bilit th d l t
for reliability assessment, they are also
useful for quality management at the
back end of the development process.
• Models developed from a previous product or
a previous release of the same product can be
used to track the testing defects of the
current product.
d
• To have significant improvement, the defect
arrival rate ( f il
i l t (or failure d i ) of the
density) f h
current project must fall below the model
curve.
curve

• The QIP involved five extra activities:
1. Blitz testing — "artistic" testing in stressful
environments.
2. Customer evaluation — customers conducting
testing in the development laboratory.
3.
3 Code inspections — additional inspections of
error-prone modules, especially routines that are
difficult to test such as the error
recovery/exception h dli routines.
/ ti handling ti
4. Design reviews — re-review of designs of suspect
components and modules.
p
5. Extension of system test — improvement of test
suites and extension of testing schedules to allow
thorough final test execution.

• Because of the special QIP activities, the
p
product ship date was delayed one
p y
month.
• As a result more than 250 field defects
result,
were found and removed.
• The field quality of the product, evidenced
by field defect arrivals reported in later
y p
years, improved significantly.

Reliability growth models for quality management

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