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Squeak and rattle is an important sub Noise and Vibration attribute which can be easily noticed by the costumer. A rattle was observed at seat belt retractor during subjective evaluation at a special test on a rough road It was developed an objective metric, in laboratory, with the aim to establish an acceptance criteria for the part. The objective of this paper is to show how noise, vibration and harshness engineers worked on the correlation between subjective and objective evaluation concerning this rattle.