C.16.MR:4.3 - Include the influences needed by the question

Ask which features of the arrangement can change the interpretation at the intended range or decision boundary. Relevant candidates include loading the subject, offsets, limited resolution, sampling, timing, saturation and dependence on environmental or operating conditions. Follow the procedure to choose among them.

Describe a consequential effect where it enters the relation. An offset at an instrument’s input can propagate differently from an offset added to its displayed output. A known correction follows from that relation; an uncertain effect retains its uncertainty. Several effects can be modeled together when their combined contribution is sufficient for the use.

Retain an unknown influential value as unknown. Available bounds or a justified probability model can support a useful conditional answer. Do not assign zero solely because the influence has not been measured.

Compare omission with inclusion at the needed result. A simple limiting case or a bound can show that an influence is negligible for this question. Keep the condition under which that conclusion holds, so a tighter requirement can reopen it.