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If you are building something and do not know a measurement, then this can mess up the whole thing.

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The measuring device might be inaccurate or there might be an angle or round surface that is tougher to get a measurement of.

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The measuring device might be inaccurate or there might be an angle or round surface that is tougher to get a measurement of.

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The wrong units or inaccurate tools.

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The shape of the thing that was being measured.

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The shape of the material, and the type of measurement you are doing.

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If there are curves in or anything other a straight line in whatever you're trying to measure

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The work environment

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Human interpretation of where the measurement lies

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Human interpretation of where the measurement lies

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Some factors might be:
- the units of measurement you are using
- the measurement relative to other things
- just by the way things look from different angles and perspectives could get anyone to second guess themselves

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-Movement from whoever is measuring.
-curvature of a object