Abstract: This paper is about the work that takes place during large police operations in different command post settings, and how artefacts are used in the collaborative process in creating a common operational picture (COP). We apply “artefactual multiplicity” as our analytical lens. An interpretative research approach has been applied in form of ethnographical field studies using observation and informal interviews as data collection techniques. The artefacts that have been studied are definable as common artefacts, i.e. artefacts that are commonly available in our work environment. Based upon the five separate studies, the artefacts studied are found to be very important as collaborative tools and many also have embedded visualization functionalities. The main contribution from this research is 1) extensive knowledge about how the artefacts are used in the establishment of the COP during large police operations, where the process of establishing the COP is, to a very large extent, dependent upon the artefacts' collaborative and multiple functions; 2) the proposal and suggestion to study the whole staff and the artefacts used by the staff as one heterogeneous unit, as a record of activities. Studies of single artefacts in isolation reduce the possibility of seeing the full multiplicity of all the artefacts used within the staff, and the complexity of the intertwined web of artefactual functions.