* [ ] 2 Population Who is involved-**ACTORS**) **Stakeholders** **PARTICIPANTS** This concerns variables which supply information about the "inhabitants" (population, residents, colleagues, customers) of the system, i.e. the species in question and its members present, state and density of population, increase and decrease in population, migration, commuters and voyagers, birth and death rate but also age structure and diversity of manpower. Property = Participant - Actor