These kinds of charts are useful in subject with intensive logical procedures, such as math. In math one must follow specific logical procedures in order to solve a given problem, thus one can take use of these kinds of flowcharts in explaining or understanding the required procedures in solving a given math problem. But one subject area that this does not apply is English. Since English is more of a subject left for free interpretation rather than a logical one, writing a flowchart would be pointless. Writing an essay requires more free imagination than definitive logical procedures.
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