The Value of Software Design

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Diego A. Gil Aguilar

An Overwiew on the value of software design and how bad quality code can prevent us from truly succeeding with agile

Software

How can you tell if a code is good or bad?

What would Robert C. Martin (Uncle Bob) tell you if he
finds out you are doing bad code?
Software Craftsmanship

Why bothering doing good quality code?
“If software design is worth doing, there got to be an
economic reason, not a moral reason” - Martin Fowler

“We need to put less effort on quality so we can build
more features for our next release”
Have you heard this phrase before?
Tradable Quality

Why would a client ignore or
not value software quality?

The Land that Scrum Forgot
https://www.scrumalliance.org/community/articles/2010/december/the-land-that-
scrum-forgot

The ‘debt’ metaphor
Ward Cunningham coined the term
http://c2.com/cgi/wiki?WardExplainsDebtMetaphor

Design Stamina Hypothesis (Martin Fowler)
http://martinfowler.com/bliki/DesignStaminaHypothesis.html

Technical Debt is inevitable… yes, inevitable
http://martinfowler.com/bliki/TechnicalDebtQuadrant.html

IRRESPONSABLE
“A mess is not a technical debt” - Uncle Bob
https://sites.google.com/site/unclebobconsultingllc/a-mess-is-not-a-technical-debt

Agile Manifesto
Agile Principle:
“Continuous attention to technical excellence and good design enhances agility”
Most of the agile manifesto signers were already XP practitioners

Thanks!
Diego Alonso Gil Aguilar, @diegogil1989
Software Engineer at Avantica Technologies
CSM, CSD and survivor of Alistair Cockburn Agile
Advanced Class
Join your local agile community:
Agile Perú: http://bit.ly/agileperu
Agile Costa Rica: http://bit.ly/agilecostarica

References
- The Value of Software Design - Martin Fowler
https://www.youtube.com/watch?v=8kotnF6hfd8#t=2694
- The Land that Scrum Forgot - Robert C. Martin
https://www.scrumalliance.org/community/articles/2010/december/the-land-that-scrum-forgot
- Ward Explains Debt Metaphor - Ward Cunningham
http://c2.com/cgi/wiki?WardExplainsDebtMetaphor
- Design Stamina Hypothesis - Martin Fowler
http://martinfowler.com/bliki/DesignStaminaHypothesis.html
- Technical Debt Quadrant - Martin Fowler
http://martinfowler.com/bliki/TechnicalDebtQuadrant.html
- A mess is not a Technical Debt - Robert C. Martin

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The Value of Software Design

1. The Value of Software Design

2. How can you tell if a code is good or bad?

3. What would Robert C. Martin (Uncle Bob) tell you if he finds out you are doing bad code? Software Craftsmanship

4. Why bothering doing good quality code? “If software design is worth doing, there got to be an economic reason, not a moral reason” - Martin Fowler

5. “We need to put less effort on quality so we can build more features for our next release” Have you heard this phrase before? Tradable Quality

6. Why would a client ignore or not value software quality?

7. The Land that Scrum Forgot https://www.scrumalliance.org/community/articles/2010/december/the-land-that- scrum-forgot

8. The ‘debt’ metaphor Ward Cunningham coined the term http://c2.com/cgi/wiki?WardExplainsDebtMetaphor

9. Technical Debt

10. Design Stamina Hypothesis (Martin Fowler) http://martinfowler.com/bliki/DesignStaminaHypothesis.html

11. Technical Debt is inevitable… yes, inevitable http://martinfowler.com/bliki/TechnicalDebtQuadrant.html

12. IRRESPONSABLE “A mess is not a technical debt” - Uncle Bob https://sites.google.com/site/unclebobconsultingllc/a-mess-is-not-a-technical-debt

13. Agile Manifesto Agile Principle: “Continuous attention to technical excellence and good design enhances agility” Most of the agile manifesto signers were already XP practitioners

14. Thanks! Diego Alonso Gil Aguilar, @diegogil1989 Software Engineer at Avantica Technologies CSM, CSD and survivor of Alistair Cockburn Agile Advanced Class Join your local agile community: Agile Perú: http://bit.ly/agileperu Agile Costa Rica: http://bit.ly/agilecostarica

15. References - The Value of Software Design - Martin Fowler https://www.youtube.com/watch?v=8kotnF6hfd8#t=2694 - The Land that Scrum Forgot - Robert C. Martin https://www.scrumalliance.org/community/articles/2010/december/the-land-that-scrum-forgot - Ward Explains Debt Metaphor - Ward Cunningham http://c2.com/cgi/wiki?WardExplainsDebtMetaphor - Design Stamina Hypothesis - Martin Fowler http://martinfowler.com/bliki/DesignStaminaHypothesis.html - Technical Debt Quadrant - Martin Fowler http://martinfowler.com/bliki/TechnicalDebtQuadrant.html - A mess is not a Technical Debt - Robert C. Martin

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