It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.
In self defence, it is not enough to learn by rote and then churn out techniques.
This simply will not work in reality.
You need to proceed with no techniques, no formulas, no methods.
Intelligence is not about planning or being prepared in advance.
It is about 'thinking on your feet', making the best use of what is available and being capable of instantaneous change.
Appropriateness is entirely contingent upon your ability to keep adapting, changing and improvising.
You do what is necessary, and you keep on changing as the situation demands.