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The basic rule is that any piece of writing must take account the audience as well as the purpose. If the audience is children, for example, then simple, short sentences with familiar words should be used. The style would be informal, even chatty. The content would also be tailored to that within the experience of the children, On the other hand, writing a society or a professional audience would use much more formal language, and would use technical jargon. Writing for a general audience is perhaps most difficult of all, and would involve some technical terms and less formal style. However, the purpose of the writing could also influence the style and obviously, the content too.Please let me know if you need any clarification. I'm always happy to answer your questions.
If the audience understood the writing and liked the style (and its entertainment value too - the purpose of the writing as far as the audience was concerned) then they would judge it to be of good quality.
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