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OSIDs are blind whether this integration is internal or external. Internal integration issues plague us all the time. This is especially true in larger systems that have evolved over time or developed piecemeal by different parties. By using the same separation techniques, OSIDs enable different pieces of a system to evolve independently or be developed in parallel. Change is inevitable, and we don't want to throw away or refactor a large investment because a change in technology rippled through an entire system.
This works. We've used it.