Open Access. The published version of this work has been reproduced here with permission.
This article may be downloaded for personal use only. Permission to reproduce this article must be sought from the Informa Healthcare and Speech Pathology Australia. This article was first published in the International Journal of Speech-Language Pathology, 11(5): 344-357, 2009. More information about this publication may be found at http://informahealthcare.com/loi/asl
Copyright (2009) The Speech Pathology Association of Australia Limited.
International Journal of Speech-Language Pathology, 11(5): 344-357