Artur Górski - How many defects are left

1. MOTOROLA SOLUTIONS
How many defects
are left?
© 2015 Motorola Solutions, Inc.
ARTUR GORSKI

2. How many defects
are left?
How many defects
are you going to
find?
© 2015 Motorola Solutions, Inc.

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METHOD 1

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Use Feedback

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Development System Tests Deployment
80

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Development System Tests Deployment
80 40

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Development System Tests Deployment
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Development System Tests Deployment
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Development System Tests Deployment
80 3040

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Defects found during System Tests
DefectsfoundduringDeployment

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DefectsfoundduringDeployment
Defects found during System Tests

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METHOD 2

17. Source of defects?
COMPLEXITY
INJECTION RATE
SIZE
© 2016 Motorola Solutions, Inc.

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Number of injected defects
Probability

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CumulativeNumberOfDefects
Iterations

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Iterations
CumulativeNumberOfDefects

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CumulativeNumberOfDefects
Iterations

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All models
are wrong,
but some
are useful
George E.P. Box
“

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METHOD 3

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Waloddi
Weibull
(Sweden)

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Metrics and Models in Software Quality Engineering, 2nd Edition [Chapter 7]
Software Reliability
Engineering

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CumulativeNumberOfDefects
Testing effort or Time

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CumulativeNumberOfDefects
Testing effort or Time

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METHOD 4

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Metrics and Models in Software Quality Engineering, 2nd Edition
Cell 1Cell 2
Cell 3 Cell 4

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Metrics and Models in Software Quality Engineering, 2nd Edition
Cell 1Cell 2
Cell 3 Cell 4

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Metrics and Models in Software Quality Engineering, 2nd Edition
Cell 1Cell 2
Cell 3 Cell 4

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Metrics and Models in Software Quality Engineering, 2nd Edition
Cell 1Cell 2
Cell 3 Cell 4

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Without data
you`re just
another person
with an opinion
W. Edwards Deming
“

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Start presenting state of quality with defects prediction.
@gorski_artur
Cell 3 Cell 4
Cell 2 Cell 1
artek.gorski@gmail.com