This chapter develops an approach to questions as sets of possible answers, with answers now construed as sets of assignments (possibilities). Type-driven movement of the question operator introduces quantification over assignments. Compositional derivations are provided for various types of shifting phenomena, such as in yes/no questions, wh questions, “interrogative flip,” and conditional and correlative questions. Additional topics for discussion include D-linking and weak crossover with wh words; commonalities among interrogative, conditional, and correlative clauses; and comparisons among expressions analyzed as choice-function pronouns throughout the book (wh words, relative words, indefinites, anaphoric proforms, names).