For better or worse, linguistics is rife with frameworks, each with its own ethos. Two important aspects of Head-driven Phrase Structure Grammar's are: (1) the search for an explicit and exhaustive account of the intricate syntactic and semantic facts that constitute one's grammar and (2) the hypothesis that general/universal and specific aspects of one's grammar are not qualitatively distinct. This book stands as a superb example of this ethos. It illustrates the fecundity of Head-driven Phrase Structure Grammar (henceforth, HPSG) as a framework and advances our knowledge of the syntax and semantics of interrogatives. It is the most explicit description of the semantics and syntax of any area of English syntax of which this reviewer is aware. It thus sets up a healthy empirical benchmark for other theories of interrogatives. The sixty pages of appendices that detail the grammar discussed in the book and its almost complete implementation in the current version of the English Resource Grammar attest to this empirical bent. Any future theory will have to match it in accuracy before any metatheoretical issues (e.g. simplicity or explanatory adequacy) can be meaningfully discussed. Its precision and comprehensiveness will also, hopefully, lead to descriptions of unbounded dependencies and clause-types in other languages that are orders of magnitude more detailed than those currently available. Ginzburg & Sag's (G&S's) book also illustrates how possibly universal principles (such as the requirement that head-daughters and mothers of a local tree share information) and construction-specific requirements (such as the fact that the scope of