In order to vet a potential trading strategy, it is imperative to ensure that the results obtained from optimizations and strategy tests are a true reflection of the EA. As seen in the image below, the default strategy tester for MT4 causes issues when testing scalping EAs. In the first image we use the standard tester, with default data, and in the second we port over to tick data. The initial perception is that of a flawless strategy – but this is simply derived from poor data analysis. In this article we will cover the steps to ensure accurate testing on both MT4 and MT5, and touch on some elementary data science to help filter potential strategies.