1. A non-transient computer readable medium embodying instructions executable by a processor to perform a method for authoring a multi-channel application model, the method steps comprising: generating a plurality of modality specific representations of an application, wherein the plurality of modality specific representations correspond to different modalities of interaction on respective channels having different respective characteristic access mechanisms, wherein the channels are simultaneously available and synchronized; flagging a component of a first modality specific representation of the plurality of modality specific representations of the application to indicate that an interaction associated with the component is not synchronized across the channels of the plurality of modality-specific representations of the application; receiving edits to the flagged component of the first modality-specific representation and generating an edited component; and generating a modality-independent representation of the application from the plurality of modality specific representations, the modality-independent representation of the application synchronizing the plurality of modality specific representations including the edited component across the channels.