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Interactive Voice Response Units (IVRUs) answer the phones more often than people do in many business domains, including Telecommunication, Personal Finance, Utilities, etc. This paper presents the results of a research study that Sprint initiated to solve a specific business problem within its IVRU. Two design approaches were assessed, pitting a Natural Language with Directed Dialog Fallback structure versus a traditional Directed Dialog framework. Key measurements included task completion and efficiency. The Natural Language with Directed Dialog Fallback design slightly outperformed the Directed Dialog approach by providing a compelling hybrid of two archetypal IVRU approaches.

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