The Thinker's Toolkit: 14 Powerful Techniques for Problem Solving

The necessary elements are all there (at least if you’ve done your observational and imaginative work). The trick is in what you do with them. Are you using all available evidence, and not just what you happen to remember or think of or encounter? Are you giving it all the same weight, so that you are truly able to sift the crucial from the inciden

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I have been aiming to discuss taking action and being decisive in two essays because there seems to be a belief that 'rationality' and mental models are all you need to succeed. Most influential people make better decisions and use thinking tools that assist them in achieving their goals more quickly.