(Invited Expert Article) This paper focuses on how the development of principled blended learning materials can facilitate the acquisition of an L2. By materials development I mean the design, production, and utilisation of anything intended to facilitate language acquisition. This could be a story, a listening activity, a debate, a photo, a video, a board game, a communication task, a blog, a discovery task, an advertisement, an e-mail or even a sequence of questions. By principled I mean informed by what we know from research and observation about what best facilitates language acquisition. By blended learning I mean learning which makes use of both face to face and a distance modes to facilitate language acquisition. And by the acquisition of an L2 I mean the gradual development of the ability to communicate effectively in a second or foreign language. To help learners achieve language acquisition I am advocating the principled design and use of blended learning materials. I am also specifying what I think are the four most important principles of language acquisition and for each one deriving and exemplifying principles and procedures of materials development.
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