Critical thinking is that thing have no limit and no board to stop in it something like fly in space and everybody can be a critical thinker doctor , parents, lawyers and teachers can use the critical thinking in there jobs and there life. The critical thing can help person to do and have good result in his all life and the critical thinking can willing to examine him self and have open mind to solve problems by different ways and listen to any body and before say any thing look to the evidence and share the idea with other so all these will help any one to become a critical thinking. So e we need a critical thinkers because they look always for batter thing for there job and there country.
There is a hierarchical classification of the levels of thinking called "BLOOM'S TAXONOMY" and they are six level, evaluation, synthesis, analysis, application, comprehension and knowledge and each of them have a different definition like evaluation mean rating or grading or assaying. The synthesis means recreating and putting back together in different way. The analysis means examining and taking part then application and it mean using knowledge to solve problems. The comprehension means understanding and interpreting. Last one is knowledge means naming and recalling.