> "A system’s function or purpose is not necessarily spoken, written, or expressed explicitly, except through the operation of the system. The best way to deduce the system’s purpose is to watch for a while to see how the system behaves. Purposes are deduced from behavior, not from rhetoric or stated goals.” —- Donella Meadows

The purpose of a system is what it does.[1]

[1] https://en.wikipedia.org/wiki/The_purpose_of_a_system_is_wha...