Feeling and Thinking are __Judgment functions__, and critical thinking is __judgment__ or discernment. How you apply what you have gathered. *Anyone* can think critically, and it is required to solve the simplest to the most complex problems. People are born helpless, and children do childish things, and teenagers do *stupid* things, but as our ability and skill in critical thinking grows, we are able to become increasingly independent.

One definition of critical thinking is "includes a commitment to using reason in the formulation of our beliefs," and this sounds very Fi to me. A lot of introspection is implied here, and don't tell me that you just *feel* your values and don't ever try to apply them or refine them! (Because that would mean you would still believe the same things you did when you were 5, and I hope you've matured a bit since then!)

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I'll relate F and T critical thinking to math:

So a logic-based system(T) can be represented by an actual number in our math problem. Logic doesn't try to mask anything or pretend to be anything other than what it is. Prior to writing out our math problem, the T judger solved many logic systems, which provided the judger with numbers to use in the new problem. So the T judger gets to simply plug the numbers into their critical thinking problem they have encountered, and they arrive at a solution. This solution is another number that they can now use in different problems.

For the value-based system(F), I'll use an equation containing a variable to represent this in our math problem. F-Values are not an exact thing like a number, but they do follow logical rules. Before writing out the math problem, the F judger takes stock of their particular values/rules towards a situation. When something can replace the variable in the equation, the equation will simplify into a number. Even if an exact number for the variable doesn't exist, the judger can still simplify the equation as much as possible, and depending on other variables, they may be able to solve the critical thinking problem completely. If they can't solve it, they have still gained another equation/rule that they can use in further critical thinking problems.

Both methods are logically sound ways of solving problems. The F and T solvers both followed the same rules for problem-solving, and they arrived at a logical end(though not always an *exact* end), and __that__ is critical thinking.