  Moving to the other side of the dissociation, since it is hard to say exactly what about language is disrupted in cases of SLI, it is difficult to determine whether this disruption is specific to language, let alone grammar. While researchers like Van der Lely and Christian 2000, and van der Lely and Ullman 2001 argue that there is a purely grammatical form of the deficit, which does support the hypothesis of a grammar module, this is controversial, as we have seen above. Certainly consideration of the KE's does not support such a hypothesis. Their root deficit appears to concern orofacial praxis, rather than language specifically; and in addition, their ‘general intelligence,’ as measured by tests of non-verbal intelligence, while “normal,” nonetheless appears to have been affected by their neurological and/or linguistic abnormalities — witness their scores 18-19 points lower than those of their relatives. It is, in other words, unclear that there is any dissociation of language and general intelligence in this case at all. One can conclude that as things stand now, SLI seems to be so heterogeneous a disorder as to defy neat characterization, and that consideration of this disorder does not support the view that there is a language or grammar module that functions independently of other cognitive processes.