Software Quality for Programmers
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The document discusses software quality, defining it as the capability of a software product to meet requirements and emphasizing customer perspectives on quality. It presents various formal quality measurement models, metrics, and code quality measurement methods, highlighting the importance of craftsmanship, best practices, and organizational involvement in delivering high-quality software. Key conclusions include the significant impact of maintenance costs on the application lifecycle and the potential for developers to improve quality through various methodologies.
Software Quality for Programmers
- 1. Software Quality for Programmersversion 1.0 Paweł Klimczyk Gemotial 2016
- 2. About me • Software engineer • Running Gemotial Software Studio • Co-organizer ofWrocNET • Blog: http://blog.klimczyk.pl • Contact: • Twitter @pwlklm • Mail: [email protected]
- 3. 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. ” @pwlklm blog.klimczyk.pl Wikipedia
- 4. Quality in construction @pwlklm blog.klimczyk.pl http://www.leica-geosystems.es/images/new/product_solution/app_eng_siterunner.jpg https://s-media-cache- ak0.pinimg.com/originals/97/ea/a4/97eaa4fb3555decb132dc12064072e8c.jpg
- 5. „Quality” in code @pwlklm blog.klimczyk.pl
- 8. How do it in IT ? @pwlklm blog.klimczyk.pl How check quality in software ?
- 9. Measurement - WTF per minute measurement aka Code Review @pwlklm blog.klimczyk.pl
- 10. Measurement – Code Review @pwlklm blog.klimczyk.pl https://www.jetbrains.com/upsource/features/screenshots/Features-team-collaboration.png
- 11. Measurement - It’s not a bug, it’s a feature @pwlklm blog.klimczyk.pl
- 12. Measurement - ROI @pwlklm blog.klimczyk.pl
- 13. Quality and Quantity- what do you choose? @pwlklm blog.klimczyk.pl
- 14. Technical debt and maintenace @pwlklm blog.klimczyk.pl Producing more code leads to technical debt
- 16. Bad Quality Examples https://pl.wikipedia.org/wiki/ExoMars @pwlklm blog.klimczyk.pl
- 17. Code Quality Core @pwlklm blog.klimczyk.pl Correctness Readability Performance
- 18. Formal Software Quality Measurement Models @pwlklm blog.klimczyk.pl 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)
- 19. Formal Software Quality Measurement Metrics @pwlklm blog.klimczyk.pl Integrity Usability Reliability Correctness Efficiency Testability Maintanability Flexibility Portability Reusability Interoperability Performance Supportability Compability Configurability Security Operability Stability Safety Analizability Changeability Maturity Accuracy
- 20. Formal Code Quality Measurement Methods @pwlklm blog.klimczyk.pl Cyclomatic Complexity Lines of code Cohesion Code Coupling Circular Dependency Temporal Coupling
- 21. SOLID, Design Patterns,TDD, XP. @pwlklm blog.klimczyk.pl SOLID Design Patterns Extreme programming Test driver development Domain driven development Best practicesContinuous Integration Continuous deployment
- 23. Developer skills @pwlklm blog.klimczyk.pl http://manifesto.softwarecraftsmanship.org/ Not only working software, but also well-crafted software Not only responding to change, but also steadily adding value Not only individuals and interactions, but also a community of professionals Not only customer collaboration, but also productive partnerships
- 24. The Software Craftsman @pwlklm blog.klimczyk.pl Sandro Mancuso
- 26. Organization quality triangle @pwlklm blog.klimczyk.pl
- 27. Conclusions (I) Whole organization contributes in delivering quality What quality do we deliver? @pwlklm blog.klimczyk.pl
- 28. Conclusions (II) What developers can do to improve quality? @pwlklm blog.klimczyk.pl •Craftmanship •SOLID + Design Patterns + tooling •XP,TDD, BDD, DDD •Change organization or change organization
- 29. Conclusions (III) Maintenance costs is ~75% of total costs in application life-cycle @pwlklm blog.klimczyk.pl
- 30. Thank you! Contact • Blog: http://blog.klimczyk.pl • Twitter: @pwlklm • E-mail: [email protected] Q&A