When I started Scrum I was a major proponent of the INVEST principle, especially when it came to Estimable, Small and Testable. Not that the others weren't important, but I strived in breaking down stories to be as small as possible, and with that they naturally became easy to estimate and easy to test. When I knew that an epic would require significant technical background work to support the user facing feature, I would generally make that its own story. I know that violates Independent (which is hard enough to do), and one could argue Valuable as well since it's not directly valuable
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