Think about the two scenarios:
1.  It is a clear sunny day at your airport. You are taxiing out for a VFR flight to your favorite back country airstrip.
2.  It is a cloudy, heavy overcast day with visibility near minimums. You are taxiing out for an IFR flight to your corporate headquarters 250 miles away.
Now thinking about these two scenarios, what is the common operational element in each?

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