s operation requests to the CIM server. It also receives and processes operation responses from the CIM server. CIM server: The server issues operation responses after receiving and pro- cessing requests from the CIM client. CIM object manager (CIMOM): It is a part of the CIM server that facili- tates communication between server components. 8. Metrics model: This model consists of CIM classes specifying the semantics and usage of a metric and classes containing data values captured for a partic- ular instance of the metric definition class. Metrics model facilitate dynamic definition and retrieval of metric information. Management of the transaction response time information generalized to the concept of unit of work and providing the additional metric information about the transaction can be done using metric definition. Information Models 24.4 Conclusion The SID and CIM are two widely accepted frameworks for information modeling. There is considerable divergence between the two models as they were developed by different standardizing organizations. TeleManagement Forum the developers of SID and Distributed Management Task Force the developers of CIM have jointly worked toward harmonizing the two models. The TMF document GB932/DMTF document DSP2004 has the physical model mapping and TMF document GB933/ DMTF document DSP2009 has the logical model mapping. Using a standard information model is required for system interoperability. Ease of integration is a must in telecom management space where multiple oper- ation support solutions interoperate to manage the operations in the Telco. The information models can be mapped to business process and applications where it needs to be used. In short, use of standard information models is mandatory in next generation telecom management solutions. After a brief overview of what an information model is expected to achieve, this chapter explains the basic concepts of the two most popular information models. Additional Reading 1. www.tmforum.org Latest release of the following