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We develop a commercial phone-based SDS (spoken dialog system) that supplies information to employees about their holiday-allowance. Frequently-asked-questions (FAQ) system use of the conceptual dialog language (CDL), a customized language that express patterns specific to the system's dialog model while still providing a clear picture of the dialog model to domain experts and supporting model updates. CDL's power stems from its ability to capture the specifics of an SDS application while remaining flexible enough to support a range of modeling styles and requirements. To facilitate effective communication with domain experts, modelers can translate the dialog model in CDL to an HTML document, or they can compile it to a programming language for executable code.