It&#x27;s not even measurable: its the ratio of two numbers, neither of which is actually measurable.<p>OTOH, the cost to migrate can never be greater than the cost to rewrite from scratch, since rewriting from scratch is a method of migrating.<p>And I&#x27;m not sure this ratio is ever meaningful. I get that the idea is to have a simple, scale independent measure of the impact of technical debt, but the proposal here is neither objectively measurable nor meaningful, IMO, in that role.