Harvard Says The Best Thinkers Have These 7 'Thinking Dispositions'
Yahoo Finance article by Drake Baer
Research into reasoning shows that people can make arguments for either side of an issue when they're led through the process, showing that they have the ability. But people usually don't evaluate both sides, since they don't have the disposition.
So if you want to be more inclined to critical thinking, you need to know what's in your toolbox, just as Warren Buffett would have you do.