Blurb:

While we accept that input is indispensable for acquisition, output might have a facilitative role. Output, as part of interaction, may enhance acquisition.. However, the research has yet to convincingly demonstrate that output and interaction assist in the development of formal features of the language related to syntax and there is no evidence that it plays any significant role in the properties of language governed by Universal Grammar. There is evidence that interaction may facilitate the acquisition of lexical items (words) and their meanings, and there is also evidence that it may promote acquisition of certain transparent surface features of language such as certain verb and noun inflections.