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The concept of the degree of difficulty of a human-machine voice dialogue system can be used to evaluate its feasibility. The degree of difficulty of a particular application depends on many factors. Some are obvious, but others are easy to overlook. For example, the expertise of the users has a dramatic effect on the performance of these systems. Also, the willingness of users to overlook deficiencies in the system varies widely depending on whether there are other alternatives. A comprehensive view of all the dimensions of difficulty is needed in order to assess the overall degree of difficulty.

Deployment of voice transaction services is an iterative process. Because the machine must cope with errors made by the person, and the human being must cope with errors made by the machine, the nature of the transaction is difficult if not impossible to predict in advance. Though the ultimate goal is to create a machine that can adapt to the transaction as it gains more experience, the human-machine dialogue systems of today require engineering art as well as scientific principles.


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