The aim in this paper has been to elaborate on the sociomaterial view of the IT artefact. A further purpose is to investigate if the sociomaterial perspective could serve as a theoretical foundation for conceptualising the information system as evaluation object in an interpretive approach for evaluation. The investigation take a conceptualisation of a social work information system, developed on basis of empirical work, as starting point. Several premises in the sociomaterial view match the premises in the empirical conceptualisation. A further analysis identifies several problems with using a sociomaterial view in combination with a practice perspective. The analysis elaborate on the question of theoretical grounding of conceptualisation of the information system in the context of evaluation, alternative ways to proceed are suggested.