Dependency Metrics on Packages

• Efferent (outward) couplings measure the number of packages the package we are examining depends on.
• Afferent (inward) couplings measure the number of other packages that depend on the package we are examining.
• Stable Dependencies Principle dependencies in our packages should follow the direction of stability: less stable packages should depend on more stable ones.

A stable package in the Eclipse distribution

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