The place of agreement features in a specification of possible agreement systems (Syntax)

Agreement features introduce greater complexity into agreement systems than is generally recognized. They may determine the agreement domain (Dargi) and certain combinations of feature values can rule out particular sentence types (Tsakhur). Feature interactions show three levels of complexity: just the target may be involved (German), or a computation of controller feature values may be required (Slovene), or computation may involve a covert feature (Miya).