We made a first distinction between New (or Completive) Focus and Contrastive Focus. New Focus is assigned to constituents which are to fill a (presumed) gap in the pragmatic information of the Addressee. We had reasons, however, to also assign New Focus to the questioned constituents in Q-word questions.
- Dik (1989), a pag.392

When Focus strategies are distinguished according to communicative point, the following distinctions are potentially relevant: [...] [immagine] Thus, the communicative point of Focus assignment may be the presentation of new information, or the requesting of such new information. This is the case in the question-answer pair […]. It applies not only to Q-word questions, but also to Yes/No-questions, in which case the Focus is on the truth value of proposition. This type of Focus requests or presents information pertaining to an information gap on the part of S [speaker]; there is no contrast involved with any other kind of similar information. The term “Completive” Focus may be used for this type of Focus.
- Dik (1989), a pag.282