Open Access. The accepted version of this article has been reproduced here according to the publisher's policies.
Rights
This version may be downloaded for personal use only. Permission to reproduce this article must be sought from the Taylor and Francis Group. This is the accepted manuscript of an article published by the Taylor and Francis Group in Augmentative and Alternative Communication, 27(4): 267-278, 2011, available online: http://tandfonline.com/doi/full/10.3109/07434618.2011.587831 (Please note: access via this link may only be available with a subscription)
Rights
Copyright (2011) Taylor and Francis
Type
journal article
Source
Augmentative and Alternative Communication, 27(4): 267-278