When scanning a text, all that is to be identified are the main idea, the structure and the purpose.
Scanning is reading a text quickly in order to find specific information, e.g. figures or names. It can be contrasted with skimming, which is reading quickly to get a general idea of meaning.
You will not be able to scan a text efficiently if you do not have a basic idea about that text. If the text is completely unknown to you, you should skim it first to get some ideas about that text. This will help you to guess the section or part of the text where you might find the information you need.
Thus, when scanning a text, all that is to be identified are the main idea, the structure and the purpose.
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