Selling Yourself as an Interaction Designer 
Interaction design incorporates a lot of skills from other disciplines, such as technical writing and information architecture. This article discusses the unique areas of interaction design with which technical communicators may not be familiar. Expanding your skills in these areas will help you sell yourself as an interaction designer.
Leonard-Wilkinson, Theresa A. and Jennifer B. Square. Intercom (2004). Careers>Freelance>Interaction Design