Hello everybody! I hope somebody is able to answer my questions since I want to devote my weekend to systems testing. I'm a newbie to automated trading mind you, I'm wondering how important a factor slippage is when testing a system that is based on daily or weekly data? My data is EOD and i also want to test my system in weekly in metastock also. I understand that slippage is important when daytrading short time intervalls but is it also as important when the system is designed to "catch the big moves", i.e. with daily/weekly data? Also how many percent slippage should the system be tested with, in the case of it being important to consider? (daily/weekly) (Or points..., FYI I'm using metastock) And I guess that different brokers have different slippage, and that brokers with less slippage charge more in commission. Does it pay to choose a broker with less slippage but with more slippage? I guess it's a question of position size as well...? And one more thing, would it be effective to use limit orders in order to avoid slippage? Or would it just mean sometimes order wouldn't be filled? I would appreciate any help and insights! Have a great weekend all!