Behaviourism seem to offer a reasonable way of understanding how children learn some of the regular and routine aspects of language, especially at the earliest stages. However, children who do little overt imitation acquire language as fully and rapidly as those who imitate a lot. And although behaviourism goes some way to explaining the sorts of overgeneralization that children make , classical behaviourism is not a satisfactory explanation for the acquisition of the more complex grammar that children acquire. These limitations led researchers to look for different explanations for language acquisiton.