This is because the terms are still 'pretheoretical'. They have not yet been even provisionally defined in any brazzers vault psychological theory. I will remind you of William James' words : The intention of saying a thing before he has said it is an entirely definite in­tention, distinct from all other intentions, an absolutely distinct state of con­sciousness, therefore; and yet how much of it consists of definite sensory images, either of words or things ? What we are left with is the specifically linguistic skills of identification and planning.

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Our understanding of the learning of all these skills is still very limited, and theories of language learning must be approached in the same sceptical frame of mind as theories of language performance. We can start by ruling out of brazzers court any notion that language learning or acquisition is merely a question of memorizing a set of associations between all possible sentences in the language, and a corresponding set of contextual stimuli. This somewhat naive notion was current at one time.