So arrows originating at each of
the eight variables and terminating at one or more of the other variables indicate a
direct relationship between the variables (and an indirect influence on the demand);
arrows from each of the eight variables directly terminating in ???Carrier Ethernet
Demand??? indicate the direct influence that the respective variable has on the demand.
10 It would presumptuous to assert with any certainty the non-linear impact of the many primary and
secondary variables on Carrier Ethernet
11 The terms variables, factors, and influencers are all used interchangeably.
12 These are fairly ???coarse??™ variables; each of these variables in turn are driven by other variables.
13 The relatively new field of Systems Dynamics, pioneered at MIT, uses the principles of feedback control
systems to model complex dependencies and to understand their collective impact; it can be applied in
a vast variety of scenarios and is used here to understand the drivers that can impact the growth of
Carrier Ethernet.
520 Chapter 16
Note that an arrow originating at ???Carrier Ethernet Demand??? and terminating at one
or more of the eight variables indicates a causal relationship between the demand and
that variable.
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