is used when you want to get a general idea of what is in the text but you din,t necessarily want to read it all.It allows you to seasch quickly throught it,finding out what areas a book covers and whether it is going to be useful to you.When you skim through a book,turn over the pages quickly and run your eye over the text looking for various pointers which will tell you about the content of the book.In particular,look for chepter openings,subheadings,introductions.