Software Quality for Programmers

Software Quality for Programmers

version 1.0

Paweł KlimczykGemotial 2016

About me

• Software engineer• Running Gemotial Software Studio • Co-organizer of WrocNET• Blog: http://blog.klimczyk.pl• Contact:• Twitter @pwlklm• Mail: [email protected]

@pwlklm blog.klimczyk.pl

Software quality definition

"capability of a software product to conform to requirements." (ISO/IEC

9001)

Deming:” The problem inherent in attempts to define the quality of a product, almost any product……….”Feigenbaum:”Quality is a customer determination, not an engineer's determination, not a marketing determination, nor a general management determination”Juran:” Two of these meanings dominate the use of the word: 1. Quality consists of those product features which meet the need of customers and thereby provide product satisfaction. 2. Quality consists of freedom from deficiencies. ”

Wikipedia


Quality in construction

http://www.leica-geosystems.es/images/new/product_solution/app_eng_siterunner.jpghttps://s-media-cache-ak0.pinimg.com/originals/97/ea/

a4/97eaa4fb3555decb132dc12064072e8c.jpg


„Quality” in code


Quality check

http://www.e-architect.co.uk/images/jpgs/singapore/uob_plaza_one_two_tr010709_1.jpg

https://i.kinja-img.com/gawker-media/image/upload/18mllspae8l8tjpg.jpg


„Great refactor”

https://assets.bwbx.io/images/users/iqjWHBFdfxIU/i0dwq8cFhDmE/v1/-1x-1.jpg


How do it in IT ?

How check quality in software ?


Measurement - WTF per minute measurement

aka Code Review


Measurement – Code Review

https://www.jetbrains.com/upsource/features/screenshots/Features-team-collaboration.png


Measurement - It’s not a bug, it’s a feature


Measurement - ROI


Quality and Quantity- what do you choose?


Technical debt and maintenace

Producing more code

leads to technical debt


Effective Quality Triangle


Bad Quality Examples

https://pl.wikipedia.org/wiki/ExoMars




Code Quality Core

Correctness

Readability

Performance


Formal Software Quality Measurement Models

Dromey (1992)McCall (1977)

Ghezzi (1991)

FURPS+ (1992)IEEE 1061 (1993)

ISO/IEC 9126-1 (1991)

Boehm (1978)

ISO/IEC 25010:2011 (2011)

ISO/IEC 9126:2001 (2001)

SATC (1995)

Kazman (2003) CMM (1991)


Formal Software Quality Measurement Metrics

Integrity Usability

Reliability

Correctness

Efficiency

Testability

Maintanability

Flexibility

Portability

Reusability

Interoperability

Performance

SupportabilityCompability

Configurability

Security

Operability

Stability

SafetyAnalizability

Changeability

Maturity

Accuracy


Formal Code Quality Measurement Methods

Cyclomatic Complexity

Lines of code

Cohesion

Code Coupling Circular Dependency

Temporal Coupling


SOLID, Design Patterns, TDD, XP.

SOLID

Design Patterns

Extreme programming

Test driver development

Domain driven development

Best practicesContinuous Integration

Continuous deployment


Tooling

Jira

TeamCity

JenkinsSonarQube

UpSource

NDepend/JDepend

JUnit/NUnit

FindBugs

JarAnalyzer

UCDetector

Cobertura

Checkstyle

FxCop

StyleCop Bamboo


Developer skills

http://manifesto.softwarecraftsmanship.org/

Not only working software,but also well-crafted softwareNot only responding to change,but also steadily adding valueNot only individuals and interactions,but also a community of professionalsNot only customer collaboration,but also productive partnerships


The Software Craftsman

Sandro Mancuso


Specifications


Organization quality triangle


Conclusions (I)

Whole organization contributes in delivering

quality

What quality do we deliver?


Conclusions (II)

What developers can do to improve quality?•Craftmanship

•SOLID + Design Patterns + tooling•XP, TDD, BDD, DDD•Change organization or change organization


Conclusions (III)

Maintenance costs is ~75% of total costs in application

life-cycle

Thank you!

Contact• Blog:

http://blog.klimczyk.pl• Twitter: @pwlklm• E-mail:

[email protected]

Q&A

Date post:	22-Feb-2017
Category:	Technology
Upload:	pawel-klimczyk
View:	154 times
Download:	5 times

Software Quality for Programmers

Technology