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Absolutely brilliant book. It's a series of very small chapters, one to two pages framed by a simple sketch to introduce the idea.
Some examples:
Embrace constraints
Don't copy
Pick a fight
Illusions of agreement
ASAP is poison
Key ideas:
1. Plans are harmful. They're an illusion that you can predict the future. Respond better to reality.
2. Ignore the competition. You'll end up copying their ideas if you don't rather than developing your own.
3. You don't need to waste time in meetings or paperwork. 90% of this will go away on it's own.
4. Most business functions are excuses. Do it yourself.