“…Both interspeaker and intra-speaker variation can be seen to pose problems for linguistic theory, and, as we have seen, some theorists consciously decide to ignore these problems, believing that theoretical linguistics should deal only with categorical phenomena, or at most should describe what is possible, not what is likely or unlikely (for example, Newmeyer 2003Newmeyer , 2005 summarises a range of arguments as to why theoretical linguistics should ignore variation). We have also seen that some considerable thought has been devoted to tackling these problems head-on, however.…”