Comment accroître le rôle des utilisateurs dans l'évaluation de la qualité d'utilisation d'un système

This paper presents criteria and methods which were used to evaluate the usability of several professional services within the European project ASSETS. A unified approach of user-centered method is proposed to test services at various stages of development according to their GUI or API access. The notion of perceived usability and utility are introduced to increase the user involvement in the evaluation process. In our professional context, we tried to highlight the relevance of the perceived quality of the results.