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Traditionally, Web applications have had great limitations in the usability and interactivity of their user interfaces. To overcome these limitations, a new type of Web applications called rich Internet applications (RIAs) has recently appeared providing richer and more efficient graphical components similar to desktop applications. However, RIAs are rather complex and their development requires the designing and implementation tasks which are time-consuming and error-prone. Moreover, RIA development is a new challenge for the Web engineering methodologies requiring their modification and the introduction of other concerns. In this context, we propose a new approach called OOH4RIA which proposes a model-driven development process that extends OOH methodology. It introduces new structural and behavioural models in order to represent a complete RIA and to apply transformations that reduce the effort and accelerate its development. This RIA will be implemented on the promising Google Web toolkit (GWT) framework.