Developing a VoiceXML Code Prototype
A voice-based application is as frustrating as a traffic jam if it doesn't meet the user's expectations. This article takes you step by step through the process of usability testing your VoiceXML application.
http://www.informit.com/isapi/product_id~%7BE4DC2C1C-2BA9-43A9-A0EB-5B0675A89975%7D/content/index.asp