Thai and Khmer are both canonical SVO head-initial languages yet at first sight seem to be head-final in their DPs with elements such as Num, CL and Dem all following the head noun N (and in the post-nominal placement of Num and CL, Thai and Khmer pattern with the canonical SOV language Burmese rather than the SVO languages listed in (3)). Other aspects of (1-3) can be similarly argued to be unexpected given the assumed general headedness of the languages in question. The chapter therefore sets out to examine what factors might be responsible for the diversity attested, asking whether there are indeed any significant principles regulating the internal structure of DPs in south east Asian languages, or whether one has to concede that the patterns are really random and unconstrained.