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Welcome to the home page for the 97 Things Every Programmer Should Know project, pearls of wisdom for programmers collected from leading practitioners. You can read through the Contributions Appearing in the Book plus the Other Edited Contributions, browse Contributions in Progress, view the list of Contributors, and also learn How to Become a Contributor. If you would simply like to comment on a contribution, please also read How to Become a Contributor as some of it applies to you.

There is no overarching narrative: The collection is intended simply to contain multiple and varied perspectives on what it is that contributors to the project feel programmers should know. This can be anything from code-focused advice to culture, from algorithm usage to agile thinking, from implementation know-how to professionalism, from style to substance, etc.

The deadline for having something considered for inclusion in the the book form of the project has passed, but the site is still open for contributions. 97 contributions have been selected and the book has now been published in O'Reilly's 97 Things series. The series already includes 97 Things Every Software Architect Should Know and 97 Things Every Project Manager Should Know. You can find out more about the series and the 97 Things Every Programmer Should Know project in this InfoQ article.

Click here to see the list of contributions selected for the book and here to see other contributions. I hope you enjoy the site! Feel free to spread the word (link to http://programmer.97things.oreilly.com, http://tr.im/97tepsk, or http://tinyurl.com/97tepsk). You can keep up to date with any news and changes by following @97TEPSK on Twitter.

Act with Prudence by Seb Rose
Apply Functional Programming Principles by Edward Garson
Ask "What Would the User Do?" (You Are not the User) by Giles Colborne
Automate Your Coding Standard by Filip van Laenen
Beauty Is in Simplicity by Jørn Ølmheim
Before You Refactor by Rajith Attapattu
Beware the Share by Udi Dahan
The Boy Scout Rule by Uncle Bob
Check Your Code First before Looking to Blame Others by Allan Kelly
Choose Your Tools with Care by Giovanni Asproni
Code in the Language of the Domain by Dan North
Code Is Design by Ryan Brush
Code Layout Matters by Steve Freeman
Code Reviews by Mattias Karlsson
Coding with Reason by Yechiel Kimchi
A Comment on Comments by Cal Evans
Comment Only What the Code Cannot Say by Kevlin Henney
Continuous Learning by Clint Shank
Convenience Is not an -ility by Gregor Hohpe
Deploy Early and Often by Steve Berczuk
Distinguish Business Exceptions from Technical by Dan Bergh Johnsson
Do Lots of Deliberate Practice by Jon Jagger
Domain-Specific Languages by Michael Hunger
Don't Be Afraid to Break Things by Mike Lewis
Don't Be Cute with Your Test Data by Rod Begbie
Don't Ignore that Error! by Pete Goodliffe
Don't Just Learn the Language, Understand its Culture by Anders Norås
Don't Nail Your Program into the Upright Position by Verity Stob
Don't Rely on "Magic Happens Here" by AlanGriffiths
Don't Repeat Yourself by Steve Smith
Don't Touch that Code! by Cal Evans
Encapsulate Behavior, not Just State by Einar Landre
Floating-point Numbers Aren't Real by Chuck Allison
Fulfill Your Ambitions with Open Source by Richard Monson-Haefel
The Golden Rule of API Design by Michael Feathers
The Guru Myth by Ryan Brush
Hard Work Does not Pay Off by Olve Maudal
How to Use a Bug Tracker by Matt Doar
Improve Code by Removing It by Pete Goodliffe
Install Me by Marcus Baker
Inter-Process Communication Affects Application Response Time by Randy Stafford
Keep the Build Clean by Johannes Brodwall
Know How to Use Command-line Tools by Carroll Robinson
Know Well More than Two Programming Languages by Russel Winder
Know Your IDE by Heinz Kabutz
Know Your Limits by Greg Colvin
Know Your Next Commit by Dan Bergh Johnsson
Large Interconnected Data Belongs to a Database by Diomidis Spinellis
Learn Foreign Languages by Klaus Marquardt
Learn to Estimate by Giovanni Asproni
Learn to Say "Hello, World" by Thomas Guest
Let Your Project Speak for Itself by Daniel Lindner
The Linker Is not a Magical Program by Walter Bright
The Longevity of Interim Solutions by Klaus Marquardt
Make Interfaces Easy to Use Correctly and Hard to Use Incorrectly by Scott Meyers
Make the Invisible More Visible by Jon Jagger
Message Passing Leads to Better Scalability in Parallel Systems by Russel Winder
A Message to the Future by Linda Rising
Missing Opportunities for Polymorphism by Kirk Pepperdine
News of the Weird: Testers Are Your Friends by Burk Hufnagel
One Binary by Steve Freeman
Only the Code Tells the Truth by Peter Sommerlad
Own (and Refactor) the Build by Steve Berczuk
Pair Program and Feel the Flow by Gudny Hauknes, Ann Katrin Gagnat, and Kari Røssland
Prefer Domain-Specific Types to Primitive Types by Einar Landre
Prevent Errors by Giles Colborne
The Professional Programmer by Uncle Bob
Put Everything Under Version Control by Diomidis Spinellis
Put the Mouse Down and Step Away from the Keyboard by Burk Hufnagel
Read Code by Karianne Berg
Read the Humanities by Keith Braithwaite
Reinvent the Wheel Often by Jason P Sage
Resist the Temptation of the Singleton Pattern by Sam Saariste
The Road to Performance Is Littered with Dirty Code Bombs by Kirk Pepperdine
Simplicity Comes from Reduction by Paul W. Homer
The Single Responsibility Principle by Uncle Bob
Start from Yes by Alex Miller
Step Back and Automate, Automate, Automate by Cay Horstmann
Take Advantage of Code Analysis Tools by Sarah Mount
Test for Required Behavior, not Incidental Behavior by Kevlin Henney
Test Precisely and Concretely by Kevlin Henney
Test While You Sleep (and over Weekends) by Rajith Attapattu
Testing Is the Engineering Rigor of Software Development by Neal Ford
Thinking in States by Niclas Nilsson
Two Heads Are Often Better than One by Adrian Wible
Two Wrongs Can Make a Right (and Are Difficult to Fix) by Allan Kelly
Ubuntu Coding for Your Friends by Aslam Khan
The Unix Tools Are Your Friends by Diomidis Spinellis
Use the Right Algorithm and Data Structure by JC van Winkel
Verbose Logging Will Disturb Your Sleep by Johannes Brodwall
WET Dilutes Performance Bottlenecks by Kirk Pepperdine
When Programmers and Testers Collaborate by Janet Gregory
Write Code as If You Had to Support It for the Rest of Your Life by Yuriy Zubarev
Write Small Functions Using Examples by Keith Braithwaite
Write Tests for People by Gerard Meszaros
You Gotta Care about the Code by Pete Goodliffe
Your Customers Do not Mean What They Say by Nate Jackson

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