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Scanning - Coggle Diagram
Scanning
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When to scan
You scan when your aim is to find specific pieces of information. If you were doing the research for an oral presentation, you could scan the index of books, web sites, and reference materials. 
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Scanning is reading rapidly in order to find specific facts
The material you scan is typically arranged in the following ways: alphabetically, chronologically, non-alphabetically, by category, or textually. Alphabetical information is arranged in order from A to Z, while chronological information is arranged in time or numerical order.
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Skimming and scanning difference
Skimming and scanning are reading techniques that use rapid eye movement and keywords to move quickly through text for slightly different purposes. Skimming is reading rapidly in order to get a general overview of the material. Scanning is reading rapidly in order to find specific facts.