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...By examining what comes into your factories, you may learn something about your suppliers and their processes as well. Consider the figure below. Let's say you expect the product to arrive with a normal distribution of specification tolerances around some mean value (see the red distribution line in the figure below). If instead you are receiving a bimodal distribution (shown with the green lines), something is happening to the units that most closely match the desired specification. For example, the supplier's manufacturing process may be out of control, or your supplier might be selling the lot(s) closest to the expected mean to one of your competitors! Understanding the cause of an unexpected supply distribution may lead to process improvements (or possibly new agreements with suppliers!).