This monograph has grown out of some issues that I began to investigate in my dissertation (Engdahl, 1980a). I am extremely grateful to the members of my doctoral committee, Emmon Bach, Chuck Clifton, Lyn Frazier, Barbara Partee, and Edwin Williams, who gave me construc- tive feedback all through the writing of the dissertation. In particular, I want to thank my chairperson, Barbara Partee, for her detailed com- ments and insightful suggestions. To a large extent, the research pre- sented in this book represents further developments of ideas and problems that came up in our weekly meetings. During this period I also discussed with Eva Ejerhed, Irene Heim, Per-Kristian Halvorsen, Lauri Karttunen, Bill Ladusaw, Jim McCloskey, Stanley Peters, Arnim von Stechow, and Annie Zaenen who in various ways made me aware of additional aspects of the semantics of questions. Several people gave me helpful comments on my dissertation, most of which have influenced the present study in one way or another. Among these people I would like to mention Murvet Enc, Gerald Gazdar, Jeroen Groenendijk, Angelika Kratzer, Fred Landman, Alice ter Meulen, Mats Rooth, and Martin Stokhof. While I was developing the analysis presented in this book, I greatly benefitted from opportunities to present my ideas to other people.