One essential aspect of trading is keeping score.
There is simply no way to improve without measuring past performance.
The critical aspect here is not to do this with measuring p/l.
The most crucial data is knowing how well you were able to execute your system. this will lead to self-reflection on possible loopholes in your execution skills and a lack of rules for the execution sequence.
Secondly, trade system performance needs to be measured, and again, the least important aspect is viewing this from a p/l view.
The risk needs to be measured, and consistency of ones approach.
Most and foremost, it all starts with collecting data.
We find two data sets imperative.
1. A trading journal that gives data insight into one's psychological behavior
2. A data collection that entails aspects of one's edges and trades taken with their specific data sets