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Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby Series)
amazon.com
There’s a fountain of happiness and productivity in working with a stable crew. It’s absolutely key to how we’re able to do so much with so few at Basecamp. We’re baffled that such a competitive advantage isn’t more diligently sought.
Jason Fried • It Doesn't Have to Be Crazy at Work
(iterate in small batches).
Ash Maurya • Running Lean: Iterate from Plan A to a Plan That Works (Lean (O'Reilly))

Start here
37signals.com
We don’t believe in busyness at Basecamp. We believe in effectiveness. How little can we do? How much can we cut out? Instead of adding to-dos, we add to-don’ts.
Jason Fried • It Doesn't Have to Be Crazy at Work
every best practice should come with a reminder to reconsider.
Jason Fried • It Doesn't Have to Be Crazy at Work
Rob Estreitinho (Salmon Labs) https://x.com/robistyping