“When you hear the term voice user interface (VUI), what comes to mind? Most likely, memories of an interactive voice response system (IVR) for customer service arise. IVRs are certainly not going away. For many companies, they remain the foremost contact point with customers. But voice user interfaces are more than just IVRs. In fact, VUIs have tremendous potential for enhancing the experience of any mobile phone user. As the use of mobile devices and applications proliferates internationally, understanding how to integrate, or mash up, graphic user interfaces (GUI) and VUIs is becoming critically important.” (Darnell Clayton and Colleen Jones – UXmatters)