**3.2 System Information & Data (SID)**

Naturally the exchange of information between processes is crucial in the eTOM. The detailed specification of the information supporting the eTOM is provided by the SID informational framework (Figure 4). The SID provides an information model capable of interpreting dynamic and static information of business processes and respects the decomposition of the eTOM. The SID specification uses extensively UML class diagrams.

Fig. 4. The main classes of SID: Product, Resource and Service.


for service design and product needs; and the **PhysicalResource(**TMF GB926 Release 4 Addendum 5 PR, 2004**)** which represents physical components of the network such as routers.

## **3.3 Execution workflows in the eTOM**

The eTOM flows during execution scenarios of SLA-monitored service deliveries describe interactions between business processes as well as the information messages that are exchanged in order to handle both cases: the normal execution and the SLA violation.
