The grammar-based NLP component developed in Groningen is based on a detailed computational grammar for Dutch, and a robust parsing algorithm which incorporates this grammatical knowledge as well as other knowledge sources, such as the acoustic evidence (present in the word graph) and Ngram statistics (collected from a large set of user utterances). It has been argued (van Noord et al. 1999) that robust parsing can be based on sophisticated grammatical analysis. In particular, the grammar describes full sentences, but in doing so, also describes the grammar of temporal expressions and locative phrases which are the crucial concepts for the timetable information application. Robustness is achieved by taking these phrases into consideration, if a full parse of an utterance is not available.