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The involvement of the ecosystem or social environment of the disabled user is considered as very useful and even essential for the human-centered design of assistive technologies. In the era of model-based approaches, the modeling of the ecosystem is therefore to be considered. The first version of a meta-model of ecosystem is proposed. It is illustrated through a first case study. It concerns a project aiming at a communication aid for people with cerebral palsy. A conclusion and research perspectives end this paper.