Souce:http://www.virtualsalt.com/think/introct.htm
You've been thinking all of your life, of course, for thinking is simply the interaction of ideas. However, thinking is somewhat similar to other skills, like writing, drawing, or fixing cars. Practice and education can improve it. So even though you "know how to think" already, you can improve your thinking by learning about the tools and mental habits that produce the best thinking.Analysis. Critical thinking might be defined as an approach to ideas from the standpoint of deliberate consideration. You hold an idea at arm's length and examine it before accepting it into your mental framework. Another way of defining critical thinking might be as a habit of cautious evaluation, an analytic mindset aimed at discovering the component parts of ideas and philosophies, eager to weigh the merits of arguments and reasons in order to become a good judge of them. Analysis is the ability to break arguments or claims down into parts and to discover the relationship between the parts. The arguments can then be evaluated.
It follows that sometimes the evaluation and judgment will be positive. Whether you are evaluating record albums, people, cars, political parties, recipes, controversial issues, books, vacation spots, whatever, there is a range of arguments stretching from good to bad about each thing, and sometimes the net result of the evaluation will be that the thing is good and worthy, right and true. Critical thinking, then, is not a cynical, negative force designed to improve your fault finding. In fact, if this class merely strengthens your ability to depreciate the arguments of your opponents, I will not have succeeded in teaching you how to think critically.
Critical thinking should be a constructive force and attitude, for examining all ideas and arguments, including your own dearly held ones, and for separating the ideas from their vehicles, to divide true from false, accurate from distorted, complete from incomplete, and so on. In fact, far from being an expert at fault finding, a critical thinker will be even more open to opposing arguments and ideas, carefully considering the merit and weight of each one, recognizing that he or she, the critical thinker, can always learn something from others, and might even be wrong in a current position.
Good thinkers develop the habit of analysis and take the time to think about claims and issues instead of just reacting to them. Thinkers take claims apart and see what is going on.
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