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How to be aware ofSoftware Quality

David Gonzalez MalineMay 15th 2012

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How do we measure SQ?

CERN GS Department

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What is Software Quality?

Functional Requirements:

• Is the software useful to the users?

Non Functional Requirements:

• Is the design appropriate?

• Is it easy to understand/maintain?

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Find the right perspective

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The 10.000ft view

http://softarch.97things.oreilly.com/wiki/index.php/Get_the_1000ft_view

• Is at the right level

• Aggregates data and metrics

• Uses visual techniques

• Depends on the question

CERN GS Department

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Metrics

• Lines of Code

• Size of Method

• Size of Classes

• Duplication

• Different complexities

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Functional Requirements

http://www.alfredodehoces.com/fuckowski-on-line

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Code Coverage

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Test/Code Ratio

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Cyclomatic Complexity

A control flow graph of a simple program. The program begins executing at the red node, then enters a loop (group of three nodes immediately below the red node). On exiting the loop, there is a conditional statement (group below the loop), and finally the program exits at the blue node. For this graph, E = 9, N = 8 and P = 1, so the cyclomatic complexity of the program is 9 - 8 + (2*1) = 3.

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Toxicity Chart

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Dependency Structure Matrix

CERN GS Department

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Dependency Structure Matrix

Pastaf

arian

!

CERN GS Department

CH-1211 Genève 23

Switzerlandcern.ch/gs-dep

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Dependency Structure Matrix

CERN GS Department

CH-1211 Genève 23

Switzerlandcern.ch/gs-dep

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Dependency graphs

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Tree Maps

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System Complexity View

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Environment Set Up

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Environment Set Up

CERN GS Department

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Environment Set Up

CERN GS Department

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Environment Set Up

CERN GS Department

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Environment Set Up

CERN GS Department

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Environment Set Up

Introscope® Workstation

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How do you see quality?

Making comparisions

• Industry standards

• Trends

• Outliers

Aesthetics

• Symmetry

• Balance/harmony

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Switzerlandcern.ch/gs-dep

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Beware of this religion!

CERN GS Department

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Switzerlandcern.ch/gs-dep

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Спасибо!David.Gonzalez.Maline@cern.ch