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Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby Series)
amazon.com

At Ink & Switch, we believe that software should be extensible in an easy, everyday manner. We believe users want to automate, customize, or even make their own tools without much ceremony. History offers us some great examples.
Szymon Kaliski • https://www.inkandswitch.com/end-user-programming/
This is end-user programming, a vision for empowered computing pursued by bright-eyed computer science visionaries.
Szymon Kaliski • https://www.inkandswitch.com/end-user-programming/
Start here
37signals.com
Good enough is fine
David Heinemeier Hansson • Rework
Pass on great people
David Heinemeier Hansson • Rework
Emulate chefs
David Heinemeier Hansson • Rework
Hire managers of one