Aristotle and the Art of Software Development

Aristotle and the art of software development Jonathan Dahl http://tumblon.com (work) http://zencoder.tv (product) http://railspikes.com (blog) Friday, September 18, 2009

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

Athens Silicon Valley Friday, September 18, 2009

Friday, September 18, 2009

Ethics. Friday, September 18, 2009

G Friday, September 18, 2009

PG Friday, September 18, 2009

PG-13 Friday, September 18, 2009

R Friday, September 18, 2009

Ethics. Friday, September 18, 2009

What makes a good programmer? Friday, September 18, 2009

Anatomy of an action Act - Effect Actor Friday, September 18, 2009

Deontology (Kant) Act - Effect Actor Friday, September 18, 2009

Utilitarianism (Mill) Act - Effect Actor Friday, September 18, 2009

Virtue (Aristotle) Act - Effect Actor Friday, September 18, 2009

Downsides Friday, September 18, 2009

Symptoms Friday, September 18, 2009

What kind of Agile? Friday, September 18, 2009

What language? Friday, September 18, 2009

Immanuel Kant Friday, September 18, 2009

Königsberg Friday, September 18, 2009

deontology duty Friday, September 18, 2009

Principles Friday, September 18, 2009

Categorical Imperative Act only according to that maxim by which you can at the same time will that it should become a universal law Friday, September 18, 2009

Deontological software development Friday, September 18, 2009

Don’t Repeat Yourself 100% Test Coverage Write readable code Friday, September 18, 2009

Act - Effect Actor Friday, September 18, 2009

Process - Outcome Participants Friday, September 18, 2009

Determine the right process Friday, September 18, 2009

(Determine the right principles) Friday, September 18, 2009

Stick to the rules Friday, September 18, 2009

“You have to follow every aspect of the process for it to work” Friday, September 18, 2009

Follow the rules, even when you don’t think you’ll like the outcome Friday, September 18, 2009

“This is just the way things are done” Friday, September 18, 2009

Ever-growing rules Friday, September 18, 2009

XP Rules 1.User stories are written. 16.The customer is always available. 2.Release planning creates the schedule. 17.Code must be written to agreed standards. 3.Make frequent small releases. 18.Code the unit test ﬁrst. 4.The Project Velocity is measured. 19.All production code is pair programmed. 5.The project is divided into iterations. 20.Only one pair integrates code at a time. 6.Iteration planning starts each iteration. 21.Integrate often. 7.Move people around. 22.Use collective code ownership. 8.A stand-up meeting starts each day. 23.Leave optimization till last. 9.Fix XP when it breaks. 24.No overtime. 10.Simplicity. 25.All code must have unit tests. 11.Choose a system metaphor. 26.All code must pass all unit tests before it can 12.Use CRC cards for design sessions. be released. 13.Create spike solutions to reduce risk. 27.When a bug is found tests are created. 14.No functionality is added early. 28.Acceptance tests are run often and the 15.Refactor whenever and wherever score is published. possible. Friday, September 18, 2009

Don’t Repeat Yourself Write clear, understandable code Friday, September 18, 2009

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 Friday, September 18, 2009

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 Friday, September 18, 2009

<% 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 -%> Friday, September 18, 2009

What kind of agile? Friday, September 18, 2009

Certiﬁcation Friday, September 18, 2009

John Stuart Mill Friday, September 18, 2009

John Stuart Mill Opposed slavery Favored women’s suffrage Free markets (...with proper regulation) Animal rights Environmentalism Friday, September 18, 2009

John Stuart Mill Opposed slavery Favored women’s suffrage Free markets (...with proper regulation) Animal rights Environmentalism ...way before these things were cool Friday, September 18, 2009

Utilitarianism Friday, September 18, 2009

Greatest good for the greatest number Friday, September 18, 2009

The ends justify the means Friday, September 18, 2009

Utilitarian software development Friday, September 18, 2009

Driven by experience Friday, September 18, 2009

Ad hoc Friday, September 18, 2009

Results-oriented Friday, September 18, 2009

Willing to compromise Friday, September 18, 2009

“Just get it done” Friday, September 18, 2009

“Doesn’t have to be pretty” Friday, September 18, 2009

Short term vs. long term Friday, September 18, 2009

No Process Friday, September 18, 2009

Lisp vs. Perl Friday, September 18, 2009

Philosophy Friday, September 18, 2009

Philosophy Ethics Friday, September 18, 2009

Philosophy Ethics Politics Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Biology Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Biology Physics Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Biology Physics Astronomy Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Biology Physics Astronomy Economics Friday, September 18, 2009

Philosophy Ethics Politics Rhetoric Aesthetics Psychology Biology Physics Astronomy Economics Logic Friday, September 18, 2009

(practical) wisdom Friday, September 18, 2009

(practical) wisdom aiming at virtues Friday, September 18, 2009

(practical) wisdom aiming at virtues combined with moral strength Friday, September 18, 2009

(practical) wisdom aiming at virtues combined with moral strength leading to happiness Friday, September 18, 2009

(practical) wisdom Friday, September 18, 2009

aiming at virtues Friday, September 18, 2009

Courage Temperance Pride Generosity Good temper Truthfulness Wit Friendliness Modesty Righteous Indignation Friday, September 18, 2009

Excess (too much) Virtue (just right) Defect (too little) Rashness Courage Cowardice Temperance Pride Generosity Good temper Truthfulness Wit Friendliness Modesty Righteous Indignation Friday, September 18, 2009

Excess (too much) Virtue (just right) Defect (too little) Rashness Courage Cowardice Indulgence Temperance Insensibility Vanity Pride Lack of ambition Prodigality Generosity Illiberality Irascability Good temper Lack of spirit Boastfulness Truthfulness False Modesty Buffoonery Wit Boorishness Obsequiousness Friendliness Cantankerousness Shyness Modesty Shamelessness Righteous Envy Spitefulness Indignation Friday, September 18, 2009

combined with moral strength Friday, September 18, 2009

leading to happiness Friday, September 18, 2009

modeling Friday, September 18, 2009

practice Friday, September 18, 2009

bootstrapping Friday, September 18, 2009

Downsides Friday, September 18, 2009

Virtue-based software development Friday, September 18, 2009

Education and training Friday, September 18, 2009

Pride Friday, September 18, 2009

Sane work schedules Friday, September 18, 2009

Empower developers Friday, September 18, 2009

Mentoring Friday, September 18, 2009

Right people -> right outcomes Friday, September 18, 2009

Natural Friday, September 18, 2009

Empower programmers Friday, September 18, 2009

Self-effacing Friday, September 18, 2009

Pleasant to write Friday, September 18, 2009

Happy and virtuous Friday, September 18, 2009

virtues, not rules Friday, September 18, 2009

virtues, not rules moderation, not excess Friday, September 18, 2009

virtues, not rules moderation, not excess judgment, not process Friday, September 18, 2009

virtues, not rules moderation, not excess judgment, not process whole of life Friday, September 18, 2009

virtues, not rules moderation, not excess judgment, not process whole of life happiness Friday, September 18, 2009

Thanks! Slides at: http://railspikes.com Aristotle, Nicomachean Ethics Friday, September 18, 2009

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Aristotle and the Art of Software Development

by Jonathan Dahl on Nov 07, 2008

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Aristotle and the Art of Software Development — Presentation Transcript