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Designing UIs that run across multiple devices is increasingly important. To address this, we have created a prototyping tool called Damask, which targets web UIs that run on PCs and mobile phones, and prompt-and-response style voice UIs. In Damask, designers sketch out their design for one device while using design patterns to specify higher-level concepts within their design. Damask's patterns include pre-built UI fragments that are already optimized for each device. Designers also use layers to specify which UI parts are common across devices and which are specific to one device. Damask uses the sketches and patterns to generate designs for the other devices, which the designers can refine. A study performed with 12 professional UI designers found that, in the early stages, designers using patterns and layers in Damask created cross-device UIs that are rated at least as good as those created without …