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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS General Services Department GS Administrative Information Services How to be aware of Software Quality David Gonzalez Maline May 15 th 2012

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS How do we measure SQ?

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS 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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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Find the right perspective

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS 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

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Metrics Lines of Code Size of Method Size of Classes Duplication Different complexities

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Functional Requirements http://www.alfredodehoces.com/fuckowski-on-line

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Code Coverage

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Test/Code Ratio

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS 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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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Toxicity Chart

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Dependency Structure Matrix

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Dependency Structure Matrix Pastafarian!

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Dependency Structure Matrix

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Dependency graphs

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Tree Maps

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS System Complexity View

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Environment Set Up Introscope Workstation

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS How do you see quality? Making comparisions Industry standards Trends Outliers Aesthetics Symmetry Balance/harmony

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS Beware of this religion!

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CERN GS Department CH-1211 Genve 23 Switzerland cern.ch/gs-dep Internet Services GS AIS ! David.Gonzalez.Maline@cern.ch