Multimodal Dialog Description for Mobile Devices The provision of personalized user interfaces for mobile de-vices is a challenging task since different devices with vary-ing capabilities and interaction modalities have to be sup-ported. Multiple variants of different UIs for one application almost enforces the employment of a model-based approach in order to design one interface and to adapt to or render it on those devices. This position paper presents a new dia-log modelling language named DISL (Dialog and Interface Specification Language) that is based on UIML and DSN (Dialog Specification Notation). DISL supports the mod-elling of advanced dialogs in a comprehensive way. The dialog descriptions are device-and modality-agnostic and therefore highly scalable with focus on limited devices, like mobile phones.