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This has also been referred to by Robert C. Martin as the Fan-out stability metric which in his book Clean Architecture he describes as Outgoing dependencies. This metric identifies the number of classes inside this component that depend on classes outside the component.
This metric is often used to calculate instability of a component in software architecture as I = Fan-out / (Fan-in + Fan-out). This metric has a range [0,1]. I = 0 is maximally stable while I = 1 is maximally unstable.
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