  We present a field study aimed at analysing the use of viewpoints in
co-design meetings. A viewpoint is a representation characterised by a certain
combination of constraints. Three types of viewpoints are distinguished:
prescribed viewpoint, discipline-specific viewpoint and integrated viewpoint.
The contribution of our work consists in characterising the viewpoints of
various stakeholders involved in co-design ("design office" disciplines, and
production and maintenance disciplines), the dynamics of viewpoints
confrontation and the cooperative modes that enable these different viewpoints
to be integrated.
