SIE.12:5.2 - A Sufficient Interface Agreement

Two providers agree to expose separately attributed on hand and available to promise values. They have no additional users maintaining a shared module.

Their agreement identifies the meanings, source owners, interface responsibilities, and change conditions. SIE.3 and SIE.9 can supply the model and interface results. Those results complete the current need. A commons arrangement becomes useful if independently maintained shared modules and their users create a further maintenance problem.