Scanning is when the user chooses to simply scan over a webpage rather then read every word that is written on it. They look for key words and phrases that might catch their eye. If they come across something that might be more interesting, then a more detailed look at the text may come. People may do this because they are in a hurry, or they simply know that not everything on a webpage may be completely vital to finding the information that they seek for.
Sacrificing is when the user will choose the first option, which may be the easiest, but not the best one available. Again, a cause for this could be users are in a hurry, and not much wrong could come out of not picking the absolute best option. The option to go back ad pick a different route will always be available, so it is reassuring that going a certain way will get the same result as going a different way.
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