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Aristotle and the art of software development
Jonathan Dahl
http://tumblon.com (work)http://zencoder.tv (product)http://railspikes.com (blog)
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Or: what does Athens have to do with Silicon Valley?
Jonathan Dahl
http://tumblon.com (work)http://zencoder.tv (product)http://railspikes.com (blog)
Friday, September 18, 2009
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Athens Silicon ValleyFriday, September 18, 2009
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Ethics.
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G
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PG
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PG-13
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R
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Ethics.
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What makes a good programmer?
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What makes a good programmer?
Friday, September 18, 2009
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What makes a good programmer?
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Act - Effect
Anatomy of an action
Actor
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Deontology (Kant)
Act - Effect
Actor
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Utilitarianism (Mill)
Act - Effect
Actor
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Virtue (Aristotle)
Act - Effect
Actor
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Downsides
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Symptoms
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What kind of Agile?
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What language?
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Immanuel Kant
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Königsberg
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deontologyduty
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Principles
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Act only according to that maxim by which you can at the same time will that
it should become a universal law
Categorical Imperative
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Deontological software development
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Don’t Repeat Yourself100% Test CoverageWrite readable code
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Act - Effect
Actor
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Process - Outcome
Participants
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Determine the right process
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(Determine the right principles)
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Stick to the rules
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“You have to follow every aspect of the process for it to work”
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Follow the rules, even when you don’t think you’ll like the outcome
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“This is just the way things are done”
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Ever-growing rules
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1.User stories are written.2.Release planning creates the schedule.3.Make frequent small releases.4.The Project Velocity is measured.5.The project is divided into iterations.6.Iteration planning starts each iteration.7.Move people around.8.A stand-up meeting starts each day.9.Fix XP when it breaks.10.Simplicity.11.Choose a system metaphor.12.Use CRC cards for design sessions.13.Create spike solutions to reduce risk.14.No functionality is added early.15.Refactor whenever and wherever possible.
16.The customer is always available.17.Code must be written to agreed standards.18.Code the unit test first.19.All production code is pair programmed.20.Only one pair integrates code at a time.21.Integrate often.22.Use collective code ownership.23.Leave optimization till last.24.No overtime.25.All code must have unit tests.26.All code must pass all unit tests before it can be released.27.When a bug is found tests are created.28.Acceptance tests are run often and the score is published.
XP Rules
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Don’t Repeat Yourself
Write clear, understandable code
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development: adapter: mysql encoding: utf8 database: app_development username: root password:
test: adapter: mysql encoding: utf8 database: app_test username: root password:
production: adapter: mysql encoding: utf8 database: app_production username: user password: password
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standard: adapter: mysql encoding: utf8 local: username: root password: development: <<: *standard <<: *local database: app_development
test: <<: *standard <<: *local database: app_test
production: <<: *standard database: app_production username: user password: password
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<% local_password = "" -%><% local_user = "root" -%><% [{:name => "development", :user => local_user, :password => local_password}, {:name => "test", :user => local_user, :password => local_password}, {:name => "production", :user => "user", :password => "password"} ].each do |environment| -%><%= environment[:name] %> adapter: mysql encoding: utf8 database: app_<%= environment[:name] %> username: <%= environment[:user] %> password: <%= environment[:password] %><% end -%>
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What kind of agile?
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Certification
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John Stuart Mill
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John Stuart Mill
Opposed slaveryFavored women’s suffrageFree markets(...with proper regulation)Animal rights Environmentalism
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...way before these things were cool
Opposed slaveryFavored women’s suffrageFree markets(...with proper regulation)Animal rights Environmentalism
John Stuart Mill
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Utilitarianism
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Greatest good for the greatest number
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The ends justify the means
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Utilitariansoftware development
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Act - Effect
Actor
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Process - Outcome
Participants
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Driven by experience
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Ad hoc
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Results-oriented
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Willing to compromise
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“Just get it done”
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“Doesn’t have to be pretty”
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Short term vs. long term
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What kind of agile?
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No Process
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Lisp vs. Perl
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Act - Effect
Actor
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Friday, September 18, 2009
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Friday, September 18, 2009
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Philosophy
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PhilosophyEthics
Friday, September 18, 2009
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PhilosophyEthicsPolitics
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
Aesthetics
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
Biology
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
BiologyPhysics
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
BiologyPhysics
Astronomy
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
BiologyPhysics
AstronomyEconomics
Friday, September 18, 2009
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PhilosophyEthicsPoliticsRhetoric
AestheticsPsychology
BiologyPhysics
AstronomyEconomics
Logic
Friday, September 18, 2009
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Friday, September 18, 2009
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(practical) wisdom
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(practical) wisdom
aiming at virtues
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combined with moral strength
(practical) wisdom
aiming at virtues
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leading to happiness
combined with moral strength
(practical) wisdom
aiming at virtues
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(practical) wisdom
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aiming atvirtues
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CourageTemperance
PrideGenerosity
Good temperTruthfulness
WitFriendliness
ModestyRighteous Indignation
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Excess (too much) Virtue (just right) Defect (too little)Rashness Courage Cowardice
Temperance
Pride
Generosity
Good temper
Truthfulness
Wit
Friendliness
ModestyRighteous Indignation
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Excess (too much) Virtue (just right) Defect (too little)Rashness Courage Cowardice
Indulgence Temperance InsensibilityVanity Pride Lack of ambition
Prodigality Generosity IlliberalityIrascability Good temper Lack of spirit
Boastfulness Truthfulness False ModestyBuffoonery Wit Boorishness
Obsequiousness Friendliness CantankerousnessShyness Modesty Shamelessness
EnvyRighteous Indignation
Spitefulness
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combined with moral strength
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leading to happiness
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modeling
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practice
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bootstrapping
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Downsides
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Virtue-basedsoftware development
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Act - Effect
Actor
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Process - Outcome
Participants
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Education and training
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Pride
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Sane work schedules
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Empower developers
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Mentoring
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Right people -> right outcomes
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What kind of agile?
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Natural
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Empower programmers
Friday, September 18, 2009
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Self-effacing
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Pleasant to write
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Happy and virtuous
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virtues, not rules
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virtues, not rulesmoderation, not excess
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virtues, not rulesmoderation, not excessjudgment, not process
Friday, September 18, 2009
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virtues, not rulesmoderation, not excessjudgment, not processwhole of life
Friday, September 18, 2009
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virtues, not rulesmoderation, not excessjudgment, not processwhole of lifehappiness
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Thanks!
Slides at:http://railspikes.com
Aristotle, Nicomachean Ethics
Friday, September 18, 2009