The evaluation ofa mobile application must be done considering its purpose and contexts on which it is suppose to be used. In this paper we introduce a multimodal artefact manipulation tool and discuss the results of its evaluation. conducted with a sub-set of its final users, in real contexts, considering. different interaction modalities (voice recognition, gesture recognition, direct interaction, and keypad), and context variables (device, noise, lighting and movement status). This evaluation enabled us to understand. user acceptance of the tool, and, the impact of specific context variables on the performance of the diferent modalities.