This chapter on
wh‐
in‐situ first provides the background of the discussion as it was developed in GB‐theory, mainly starting from Huang's seminal work on Chinese. In this framework with levels of representation, the role of Logical Form was in the center of the discussion. Similarities and differences between covert
wh‐
movement and QR are discussed, leading to issues of subjacency, LF pied‐piping, unselective binding, and D‐linking. Data and many theoretical concepts carry over to the third section of the chapter which introduces treatments of
wh‐
in‐situ within the Minimalist Program, namely a theory which admits only two interface levels and which does not have various levels of syntactic representations (e.g., S‐structure and LF). Different stages of the theory's development, from feature movement to probe/goal agreement are shown to have had different consequences. This is followed by a discussion on the possibility of pseudo
wh‐
in‐situ, that is the possibility that there is overt movement but that it is disguised in particular ways. Section 4 turns to intervention effects. Overt
wh‐
movement is compared with
wh‐
in‐situ under intervention environments. Syntactic as well as semantic accounts are presented as well as accounts that rely on information structure. Section 5 addresses the question of optionality of
wh‐
movement as it appears in modern French as well as in other languages. Here also questions of phonological phrasing are brought into the discussion. In section 6 the issue of
wh‐
in‐situ vs.
wh‐
ex‐situ is briefly discussed, also with reference to acquisition data. Section 7 concludes with some questions concerning typological differences according to which
wh‐
in‐situ languages seem to lack a richly structured left clausal periphery.