A Gentle Introduction to Agile Software Development
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Transcript of A Gentle Introduction to Agile Software Development
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A Gentle Introduction to Agile Software Development
H. Alan Stevens
Manage Complexity With Agility
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Contact Me
Slides: speakerdeck.com/alanstevens
Email/IM: [email protected]
Website: halanstevens.com
Twitter: @alanstevens
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nerdhiveindustries.com
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The Straw Man
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Software is Complex
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You Are Already Succeeding
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Pomposity
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Use What Works(For You)
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Avoid Dogma
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It’s a processIt takes Time
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Release Regularly(Every two to four weeks)
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Release: Even Internally
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Constant Velocity“Heroism is Failure”
H. Alan Stevens
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Short Horizons
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Frequent Course Corrections
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User GoalsNot Technical Requirements
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Reminder of a Future Conversation
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SWAGSophisticated Wild Ass
Arbitrary Guess
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User Story Template
As a: (Role)I want: (Something)So that: (Benefit)
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Documented in Acceptance Tests
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Avoid BDUF(Big Design Up Front)
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The Last Responsible Moment
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Do the simplest thing that could possibly work
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YAGNIYou Ain’t Gonna’ Need It!
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Loose Coupling
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High Cohesion &
Low Coupling
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Law of DemeterA class should only
communicate with its immediate neighbors
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Manage Technical Debt
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I thought that rushing software out the door to get some experience with it was a good idea, but that of course, you would eventually go back
Ward Cunningham“Ward Explains Debt Metaphor”http://c2.com/cgi/wiki?WardExplainsDebtMetaphor
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as you learned things about that software you would repay that loan by refactoring the program to reflect your experience as you acquired it.
Ward Cunningham“Ward Explains Debt Metaphor”http://c2.com/cgi/wiki?WardExplainsDebtMetaphor
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Code Smellsa hint that something might be wrong
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Follow the “Boy Scout Principle”
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Enable Change
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Common Refactorings
Rename ClassExtract VariableExtract MethodExtract Class
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DRYDon’t
Repeat Yourself
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See it once: do it
See it twice: notice it
See it a third time:
Automate It!
The Rule of Three
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OptimizeBottlenecks
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Reduce Friction
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Enable Flow
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Reduce Ceremony
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Automate the BFDs
(Big Friggin’ Deals)
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As applications mature, they should become more
maintainable, not less.
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Continuous Improvement
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“With every mistake, I must surely be learning”
George Harrison
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Work on your
process, not just in
your process
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Value Developer Cycles Over CPU Cycles
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Eliminate Waste
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Prevention is the best cure
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Avoid Complacency
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LEAN
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Slides: speakerdeck.com/alanstevens
Email/IM: [email protected]
Website: halanstevens.com
Twitter: @alanstevens
Thanks For Listening!