This phrase is used by carpenters. If you have a valuable piece of wood and you want to make a expensive table, you will have to be more than accurate. If you cut the wood without being accurate in the measurements you will most likely make a mistake and the wood will not fit properly. If the measures will not be taken with the utmost precision cutting without double-checking you will need to buy more wood. It will then certainly be wiser to take the measures twice and make sure that everything is correct since the first time. Measure twice means having to cut once. This analogy can also be applied in planning a flight. The situational awareness starts right from the ground. If your planning will not be that accurate, quickly jumping in the air, the risk of losing the SA and the actual position along the route will be doubled.
Measuring twice to…
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