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When your usability goals are accomplished, place the application in service for all of your intended callers. You may want to use a single channel at a time, to see how the system performs under load. It is important to observe the acceptance of your application, and how successful your callers are using it.
It is time consuming to listen to callers interacting with your application, but you will collect valuable data about your callers and the application. This information could influence your decisions about the present application, or ones that you will write later. For example, you may have assumed that only a few of your callers would have non-US English accents, when in fact many of them do. In this case, you probably do not want to write a speech-recognition-only application. Rather, you would encourage callers to use touchtone input.
Even when your application is available and serving your customers, it is a good idea to continue observing the application and system performance. Listen to random calls to determine how callers are interacting with the application. Ask your customers for their opinions on how to improve the voice response services you offer.
