closing the gap

sorry about the basic nature of my question but i would be interested in peoples opinions and views on gap trading. i have read in posts that the gap needs to close and observed that on gapping down, price will often then turn around and rise and visa versa. Are there any general characteristics or rules and observations that would apply in this situation.

many thanks

Luds

You'll have a difficult time finding gaps in such a liquid market.

Some gap explanation for you. Wish it helps.
http://stockcharts.com/school/doku.p...nd_gap_analysi