Organisational systems communicate and create themselves through decisions and therefore consist of nothing but premises for decision making (Luhmann 1993, Seidl & Becker 2006). Organisations are founded on principles of exclusion: Everybody is excluded from organisational communication except those who are members of the organisation i.e. who are included in the decision-making (Luhmann 1982, 1994, 2003, Andersen 2003b). Membership limitation, without subscribing to a rigid definition of membership, is therefore central to the autopoiesis of organisation.