Many languages, in addition to ordinary multiple
wh‐
questions, have a construction in which two or more
wh‐
phrases appear to be coordinated at the left periphery of the clause. This construction is referred to as a
conjoined wh‐question
(
CWH
). The two kinds of multiple questions differ not only in form, but also in interpretation: while ordinary multiple
wh‐
questions favor pair‐list readings, CWHs favor single‐pair readings. Somewhat surprisingly, CWHs are found not only in multiple
wh‐
fronting languages (
MF languages
), but also in languages that front only one or none of the
wh‐
phrases (
non‐MF languages
). While all languages with CWHs allow the coordinated
wh‐
phrases to be adjuncts (
When
and
where
did John go to school?
), only MF languages allow coordination of two
wh‐
arguments (
*
Who
and
what
saw?
). The structure of CWHs seems to vary both across languages and within a single language. This chapter surveys cross‐linguistic typology of CWHs as well as existing accounts of this construction. One type of an analysis of CWHs, the monoclausal account, claims that the
wh‐
phrases originate in a single clause and are fronted to the left periphery, where they are coordinated. On the other type of account, the biclausal account, CWHs involve a coordination of interrogative clauses. It will be shown that both types of analysis seem to be needed in order to cover the cross‐linguistic diversity of CWHs.