Identify the mistake that was made. Define the mistake, find out what caused the mistake, and try as hard as you can to better understand that mistake. Knowing the mistake nature will prevent you from making the same mistake again. More often than not, you will find the answer unexpectedly. For instance, consider the trader who is not following the system. Traders might be afraid of losing if this is the case. However, why are they afraid? It is possible that the trader is using a system that doesn't fit them, and finds it difficult to follow every signal. Since you can see, the nature of the mistake is not apparent from the surface. To find the real reason behind the given mistake, you should try your best.