Purpose – Earlier studies have identified artefacts, but have only to a lesser degree looked at theireffects. The purpose of this paper is to investigate how artefacts contribute to organisation. Design/methodology/approach – A trauma team at a university hospital has been observed andits members interviewed. Findings – The trauma team showed itself to be rich on artefacts since it had strong internal drivingforces, high legitimacy, and tried to live up to high expectations from the outside. Its members were motivated to be in the forefront of trauma care. Through renewal, the team succeeded in maintaining demarcation. It also succeeded in systemising internal work tasks and made for itself a position in relation to the outside. The team's capacity, however, came to be limited by internal conflicts and battles for prestige. Practical implications – The study shows that informal logic has a strong influence on teams.Teamwork contributed to the development of organisational structure and motivation for the personnel. Originality/value – Earlier studies advocate the important role of artefacts in order to communicate, collaborate, negotiate or coordinate activities. The conclusion is that artefacts also have an organising and developing effect on teams in a fragmented and differentiated healthcare.