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We are NOT allowed to select our products' critical characteristics, or otherwise rank from just a list. We have tools to help with the task.
means crucial to proper function or safety. It would be the o-ring sealing surface flatness and finish for a fuel system, and not the bracket that attaches a fuel line to the chassis. Ask "What is the risk to product failure or safety if this characteristic is not correct?" and you can separate your critical characteristics from the rest.
To learn more (and access attached tools) please read this thread:
DFMEA, PFMEA and KCC's
Then you can also look at the suggested threads at the bottom of the page.