The construction model (CM) of an organization specifies its composition, its environment, and its structure, according to the system definition that is provided in Chap. 6. The
are both a set of actor roles. By convention, we will always draw environmental actor roles as composite actor roles, even if we happen to know that an actor role is elementary. The reason for doing this is that generally we do not know whether an environmental actor role is elementary or composite. Moreover, we do not care: our interest is in the kernel of the organization. We start with modeling this kernel as one composite actor role. The resulting CM is usually referred to as the
CM of an organization. Likewise, the CM in which the kernel contains only elementary actor roles is called the
divides the set of all (relevant) actor roles into the composition and the environment.