Stable abstractions
The stable abstractions principles (SAP) is a package design principle that demands that the abstractness of components be proportional to their instability.
The closely-related stable dependencies principle (SDP) explains the notion of stability in this context.
The objective is for package components that represent abstract concepts and to require little or no modification, because more concrete components will depend on them. Similarly, components that should not be changed, or that could not be easily changed, should be abstract enough that they can be easily extended into new concrete components instead.
The underlying principle is that concrete things are naturally more volatile than abstract things, and the structure of a system should reflect that.
In combination with the stable dependencies principle, stable abstractions is a refinement of the dependency inversion principle (DIP). Specific concepts naturally depend on more abstract ones because they are composed or derived from more general-purpose building blocks. And dependent concepts are naturally more specific because they are defined by more information than their dependencies.