you skim whenever youbwant to get some general idears about and article or a book. For example, when you
-want to find out about a recent election. There is along magazine article on the subject, but yiu don't have time toread it all.
-need some information about the 6heories of Sigmund Freud. You have found many book about Freud,and now you need to know which one will be most useful.
-when to a movie and you though it was terrible. You notice a review of that movie in today's newspaper. You want to find out quickly if the reviewer agrees with you.
-are reading a detective story and you are in a hurry to know who did the crime.