For example, for a generic system that is designed to handle n products with n changes per product the amount of testing that must be done to check all possible combinations is n factorial. Over time, single systems serving multiple products can become over generic, with code evolving to handle all possible combinations of all possible products. A major problem we come across is that superficially the products look similar but they very different when it comes to the detail. "Hmm, consumer loans look quite similar to business loans" or "clothes are a product, so are made-to-measure curtains, how different can they be?". Often this is driven by a desire for reuse. Many applications are built to serve multiple logical products from the same physical system.
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