Chomsky regards language theory in terms
of ‘homogeneous speech community’. He (1965:3) holds:
Linguistic theory is primarily with an ideal speakerlistener
in a completely homogeneous speech community,
who knows its language perfectly and is unaffected by
such grammatically irrelevant condition as memory
limitation, distractions, shifts of attention and interest, and
errors (random or characteristic) in applying his
knowledge of the language in actual performance.