Hello, As agreed at the last OGF, Inder and I have worked on the definitions of Network, Topology and Domain. - Topology: A connected graph of Network Elements The intended usage of this is to describe the thing that a network provider advertises to others as his network topology that is available for use. - Domain: An unordered collection of Network Elements managed under the same shared policy umbrella. This describes who or what is responsible for the Network Elements. - Network: no definition We had a discussion about the meaning of this term and in the end we had to conclude that is not possible to provide a workable definition for the term 'Network'. The term Network has become so widely used for so many diverse meanings that it is impossible to create a strict definition that everyone can agree on, while still expressing something useful. Inder & Jeroen.