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The Thinker's Toolkit: 14 Powerful Techniques for Problem Solving
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Author: Morgan D. Jones
Hacker News 1
Avaliable on Amazon
You might want to check out The Thinker's Toolkit: https://www.amazon.com/Thinkers-Toolkit-Powerful-Techniques-...
One of the books I still reread. Its not so much about "abstract thinking" but its very good at teaching you to find the real problem & make a decisions.
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