This paper investigate the role played by annotation along the development process of interactive systems. Empirical observations have demonstrated that development teams often make an extensive use of annotations, mainly as a communication support. Whilst the use of annotation is a fact (also supported by many prototyping environment, IDE and model editors), very few studies have investigated the use of the annotations for building interactive systems. In this paper, we propose a process to explain this co-evolution of annotations and artefacts along the development process of interactive systems. The ultimate goal is provide mechanisms that could help the development team to follow design decisions using annotations as a support.