This work aims to extend Dynamic Antisymmetry by relying on Labelling Algorithm. The central proposal is to generalise this approach to symmetric head-head structures, the inevitable first step of any derivation. The two symmetry-breaking “repair” options available give rise to basic head-initial and head-final word orders. One of the consequences of this approach is that all word-order parameters reduce to head-movement options. We take this to be a conceptual advance for the theory of word-order variation.