Improving Sampling Techniques for Quality

An automotive OEM was facing the problem of frequent customer complaints and rejections even when the batches were internally inspected. The issue identified was the use of convenience sampling technique leading to a biased and very small sample size. A project was undertaken to statistically determine the correct sample size and identify the best sampling technique based on the nature of the processes. SOPs were updated and staff was trained to ensure sustenance of the project. The project resulted in 70% less customer complaints and 65% less customer rejections.