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The quality of data is often defined as "fitness for use", i.e., the ability of a data collection to meet user requirements. The assessment of data quality dimensions should consider the degree to which data satisfy users' needs. User expectations are clearly related to the selected services and at the same time a service can have different characteristics depending on the type of user that accesses it. The data quality assessment process has to consider both aspects and, consequently, select a suitable evaluation function to obtain a correct interpretation of results. This paper proposes a model that ties the assessment phase to user requirements. Multichannel information systems are considered as an example to show the applicability of the proposed model.