Geoff Tennant, a Six Sigma specialist from the United Kingdom, utilizes the subsequent analogy to clarify the primary difference: A grocery store's buyer is the person shopping for milk at that grocery store; a not-purchaser purchases milk from a competing grocery store, whereas a non-purchaser doesn't obtain milk from supermarkets https://arnean.com/revamping-roads-the-essential-guide-to-asphalt-paving-and-repair/