The theory that a trader must have to be successful is almost known to all traders but not all are able to carry it out well, about discipline sometimes traders will break it even a soldier who is used to discipline will also find it difficult to remain disciplined when becoming a trader.
Intellectual or skill about trading is what traders sometimes do not have so they trade like gambling just following feelings and eventually lose everything.
To become a quality trader we must continue to evaluate what trades made us lose that day and vice versa.
I would say traders fails to meet up with discipline and skills in trading. The amount of knowledge one has towards trading will determine what will be the outcome in trading. The reason why traders normally jave challenge with their outcome in trading is because is because they feel the amount of knowledge they have concerning trading is enough to make trading successful.
Trading strategies do change overtime and one don't need to rely in a trading strategy, it is important for a trader to acquire skills that can enable him to be successful in trading. When it comes to discipline it is something most people find it very difficult to practice, knowing that trading is about discipline to obtain a successful trade.