This paper investigates the roles of focus, arguing that such a notion is too wide and can be applied to several phenomena. I show that focus needs to be further specified for (at least) another feature and is therefore made of smaller primitive traits. These can combine to create bundles of features, which give rise to the several types of foci we know. Moreover, these features are subject to parametrization and can thus account for cross-linguistic differences.
Syntax. Left periphery. Focus. Focalisation. Focus movement.