Many languages classify direct objects in two classes along some semantic parameter by assigning them a mark. This property is referred to as Differential Object Marking (DOM). A non-exhaustive list of semantic parameters that have been described in the literature is the following: animacy, specificity, definiteness, topicality and telicity. The actual marking can adopt several external forms: case or adposition on the object, agreement morpheme on the verb, clitic doubling, even plain scrambling can be taken to be a form of DOM. Thus, the DOM phenomenon is a useful springboard to explore a number of questions regarding the interfaces between morphosyntax and the interpretation modules.