Choosing the right concept is also a large part of system development. Not all concepts of trading are good for every trader. Some traders feel more comfortable trading in direction of the trend while others feel more secure trading against it. This has something to do with the personality of each of us.
Usually Forex traders tend to mix concepts, sometimes traders use different concepts for different market conditions (i.e. to have a way to determine whether the market is trending or not, then choose the appropriate system).
If you are going to trade different market conditions then it is important that you use different strategies, most trend-following strategies will fail under consolidation periods and most consolidation periods strategies will fail when a trend is in place. That is the main reason, a proper training on the basic concepts is required before getting into live trading sessions.

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