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How do you calculate the real cost of customizations?

Top Answer: I normally multiply the initial cost of that customization by 20, and I work that out over time. I've seen how that cost increases so many times in different large companies. If a customization costs $50K, by the time you've redone that customization for each upgrade, taking all the extra testing into account over a lifespan of 10 years, it will probably end up costing you 20 times that initial spend. The business says that a $50K customization is justifiable, but is it worth $1M? That's the calculation you need to make and educate people on, because it’s the real cost you’ll be dealing with over time.