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Conway's Law

Conway’s Law postulates, that the design of a system, reflects the organization of the designers.

An organization, that designs a system, will produce a design whose structure is a copy of the organization’s communication structure - source: Melvin Conway, Wikipeda

The assumption is that a Complex System is created, that is sufficiently big, that it cannot be created by only one part of the creating organization. Hence, members of the organization need to communicate to align the design and work (e.g. agree on interfaces). In bigger structures, this means departments need to communicate. The resulting system by necessity is then shaped (sic) by the communication structure of the organization.