A U.S. Fortune 50's systems interconnect map for 1 division, "core systems only".
Integration patterns began changing 15 years ago. Several early attempts were made to solve the increasing problem of the widening need for integration…
Prior to SOAP (Simple Object Access Protocol) and SOA (Service Oriented Architecture) one could carefully manage the integration chaos but one couldn’t solve it. And frankly, few IT shops carefully managed it.
The picture above is a real picture. Each line represents a major transaction connection between "core" business systems at a very large IT enterprise. While each individual connection was created in response to a business need as interpreted by the IT systems creators, the overall result speaks for itself.