Often we hear: "good practice". It has long been secretly feel that there is a positive experience, but never really thought about it. Yes, and it is clear when a decision leads to success, we are trying to replicate, ie, in such situations act in a certain pattern already. Why change what has already been tested and works? And almost always leads to success. Of course, we have used previously received a positive (ie, what to do), knowledge and skills to the task. What is it but a positive experience? But something was still in such a formulation of the problem is not satisfied. First, re-use scheme has already proven results in much faster and better results.
Explain it using only proven methods is impossible. If you are moving the same way as before, and the results are about the same. So you do not make the mistakes committed in the first time. In other words, you move a shorter and less tortuous path due to the fact that not go in the already-known dead-ends you. But it can be completely and not the road on which you moved the first time. You choose the first available road (but with a great chance most of the way will pass on the previous one), avoiding the known and expected you to dead ends. Second, consider how you usually make decisions.
Calculates the possible consequences of certain decisions, and immediately reject the unacceptable. But the rest of you do not choose the best, and take away those who think the worst at the moment. The decision is not necessarily the most optimal. And with a similar problem this solution may be rejected because the previous result is already known, and it could be worse than others can provide the solutions. As in chess, there are notable debuts, and experienced chess players always know the correct move in each combination.