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Along the design process of interactive system many intermediate artefacts(such as user interface prototypes, task models describing user work andactivities, dialog models specifying system behavior, interaction modelsdescribing user interactions {\ldots}) are created, tested, revised andimproved until the development team produces a validated version of thefull-fledged system. Indeed, to build interactive systems there is a need touse multiple artefacts/models (as they provide a complementary view). However,relevant information for describing the design solution and/or supportingdesign decisions (such as rational about the design, decisions made,recommendations, etc.) is not explicitly capturable in the models/artefacts,hence the need for annotations. Multi-artefacts approaches usually argue that agiven information should only be present in one artefact to avoid duplicationand increase maintainability of the artefacts. Nonetheless, annotations createdon one artefact are usually relevant to other artefacts/models. So that, thereis a need for tools and techniques to coordinate annotations acrossartefacts/models which is the contribution of the present work. In this paper,we propose a model-based approach that was conceived to handle annotations in asystematic way along the development process of interactive systems. As part ofthe solution, we propose an annotation model built upon the W3C's WebAnnotation Data Model. The feasibility of the approach is demonstrated by meansof a tool suite featuring a plugin, which has been deployed and tested over themulti-artefacts. The overall approach is illustrated on the design of aninteractive cockpit application performing two design iterations. Thecontribution brings two main benefits for interactive systems engineering: i)it presents a generic pattern for integrating information in multiple usuallyheterogenous artefacts throughout the design process of interactive systems;and ii) it highlights the need for tools helping to rationalize and to documentthe various artefacts and the related decisions made during interactive systemsdesign. CCS CONCEPTS $\bullet$ Human-centered computing $\bullet$ Humancomputer interaction (HCI)

Engineering Annotations: A Generic Framework For Gluing Design Artefacts in Models of Interactive Systems