Let's begin with some vocabulary and acronyms and we will see why the path is hard to navigate. Here is a short list for various models as follows. The management (logical) levels defined by TMN of the Network Management System architecture: network element layer (NEL), element management layer (EML), network management layer (NML), service management layer (SML), and business management layer (BML). The TMN FCAPS model of ass functional management tasks: the management of Faults, Configuration, Accounting, Performance, and Security.

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These categories represent the five types of information handled and used by management systems. Like any model, it is an abstraction to enhance understanding. Discussing what each is and clarifying the relationship of each part between the various models is beyond the scope of this paper, partly because it would simply have 'too many words' for an introduction.