My favorite strategy for code reuse is, make API configurable. That means instead of coding, you configure the system as much as possible. Only the core , whic

My favorite strategy for code reuse is, make API configurable. That means instead of coding, you configure the system as much as possible. Only the core , which is the implementation details could be changed without affect the rest of system. One benefit/downside is that, whenever you change the core, or everything else works at the same time, or all thing breaks.