Decisions
JD-EE, CogSim and bearfoil,
None of you is wrong, and none of you is completely right. Horses for courses?
Complete loss of thrust at a low height is one thing; anomalous indications in the cockpit at FL350 would be another – prior to any upset.
If and while there's time: DODAR, and repeat as often as required. If not, some prior consideration of classic, easily-diagnosed, once-in-a-hundred-careers failures may greatly simplify the thought process on the day. But, if at all possible, you still need to keep your co-pilot in the loop: and there's also a possibility he/she may have to correct your mental model. The latter process didn't happen in the Trident between Heathrow and the Staines reservoir, for reasons blind pew can explain better than I.
In deference to bearfoil's latest post: one hopes equally that the aircraft will keep the flight crew "in the loop".