http://en.wikipedia.org/wiki/Economy_picking
In all of your playing, the idea is to not waste gas. Unless you want to make it difficult just for show. Always ask yourself, "Once I get used to it, will it be easier this way?" Trial and error. Your technique will always be re-invented over time, so experiment with everything and find out why certain things don't work.
-Carl.
Carl King[br]GuitarTricks Video Director / Producer