||Speech based user interfaces are growing in popularity. Unfortunately, the technology expertise required to build speech Uis precludes many individuals from participating in the speech interface design process. Futhermore the ime and knowledge cost of building even simple speech systems make it difficult for designers to iteratively design speech UIs. SUEDE, the speech interface prototyping dtool we describe in this paper, allows designers to rapidly create prompt/response speech interfaces. It offers an electronically supported Wizad of Oz (WOz) technique that captures test data, allowing designers to analyze the interface after testing. This informal tool enables speech user interface designers, even non-experts to quickly create, test, and analyze speech user interface prototypes.