Many companies buy systems one at a time, figure out how they will integrate to whatever is needed to just make it work (pull in some data from here, connect to an API over there) all within the constraints of the initial schedule and budget; usually with the intention of doing a more complete job of integration in "Phase 2" and beyond. Almost immediately and continuously things change"”new applications are added, the data changes, customers make demands for new data/integration, initiatives to streamline are launched, etc. As a result, there is a patchwork of integrations, both internally between the enterprise's own applications and externally with trading partners.
