Escalation of verbal communication between pilots
I (as a mere PPL holder) was curious to learn how the verbal communication between pilots in a multi-crew environment escalates when things begin to get out of shape.
For instance (just a simple scenario), a 737 positioned roughly downwind, cleared for a visual approach. Let's say the First Officer is PF.
At the point where one should normally expect to take flap (I'm not sure where this is in a 737 so apologies!) the PF doesn't do so and just continues along. What might the Captain say to get the FO to do something about it? Would the first stage just be a gentle nudge like "I would normally take flap 1 at this point"? Then say the FO responds with "I think we're ok for now" and still doesn't do anything. What is the next stage?
I imagine there must be some framework which is taught (is this CRM?) along the lines of the 1st stage: 'suggest', 2nd stage: 'tell', 3rd stage take control?
Thanks in advance for satisfying my curiosity.