i guess thats the $64000 question! i try to use the most important swing highs or lows for any projection, especially on the 15 min chart, which i use for a bigger picture overview of expected market action. its not that other lows or highs wont work ,but the more significant the low or high , the more odds of a significant bounce off the number once hit! frequently when we close to a 15 min projection for instance, suddenly the 5 min and 1 min charts begin giving the same number! As you pointed out, most of my trading is from the 1 min or 5 min chart since im so short term orientated. id tend to be in and out twice on a 6 point move for instance, taking 2 points at a time, instead of going for the whole 6 points . thats just my trading style and why i have such a high win % , most of my 'student' friends are a little longer term and they would go for the whole thing and do just fine! its just a personal preference thing.