Originally Posted by
suicidekings
4) Put some thought into the mindset of the books. The books' primary objective is typically to set the lines such that the action will be balanced on both sides (to guarantee their profits from vig). With that in mind, you can draw conclusions from situations where the betting is imbalanced and the books don't react as expected (Reverse Line Movement), or when the original line deviates from where a fair line should be and there doesn't seem to be a good reason for it (injuries, etc).