I just found this Elite Trader website and I am very impressed by the trading resources it provides. Thanks to everyone who is posting useful information here. I need some feedback about back testing methods. I use a strategy for trading stocks for short-term- 1 to 30 days. I don't use any derivatives of prices like MACD, ROC, RSI...but just the plain four prices- Open, High, Low and Close. Only recently I saw back-testing being offered on the website I use daily to run my stock scans- http://www.stockfetcher.com. Their beta version of back-testing offers testing for the six month period or early 2003. When I ran my screens, I was impressed with the results I received. Most of my signals gave me a return of more than 20% per annum versus 4% for S&P 500 during the period. This was true not only for LONG positions but also for SHORT positions. As such this was my first back testing experience so just wanted to get some realistic feedback to make it more accurate. I am posting details of one of my signals -- U TURN (BUY). This is the exact syntax I use: "Show stocks where Close gained more than .15% percent over the last 1 day and open is more than .25% below the low 1 day ago and close is above the open 1 day ago and LOW reached a new 4 week low and volume gained more than 20% over volume 1 day ago and volume is above 500000 and close above 2" I am uploading details of the BUY version as well as the SELL version of this signal. These EXCEL files have 3 sheets- first one shows the test set-up, second one summary of results and the third one lists trades itself. Would love to hear your comments about how I can make this testing more realistic. Also, would be great if you can suggest some other websites which offer infrastructure to run screens and also to back test them. Thanks.