The Chapters of this dictionary address each category of ens in a very generic manner. The generic insights, and their implications for policy, procedures and implementation must be merged with the specifics that is reflected in several classifications.
How to do this, and which classifications exist for specific categories of ens, is explained below. For the classifications, links are provided.
Ordered Diversity from Generics & Specifics
Key Global Classifications
For a comprehensive overview, see: AN ATTEMPT TO FORMALIZE "NETWORKS" OF CLASSIFICATIONS
by Emile Bruneau, INSEE, France (1988) http://unstats.un.org/unsd/class/intercop/expertgroup/1998/AC63-17.PDF