Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Dependency grammar (DG) is a class of syntactic theories developed by Lucien TesniÃ¨re. It is distinct from phrase structure grammars, as it lacks phrasal nodes. Structure is determined by the relation between a word (a head) and its dependents. Dependency grammars are not defined by a specific word order, and are thus well suited to languages with free word order, such as Czech and Turkish.