Understanding state-pairs and the significance of the number
of state-pairs allows the interface's adaptability to be
measured. The adaptability of an interface may be
quantified by counting the total number of state-pairs
available across the interface and relating it to the total
number of flexible (e.g., weighted 0.5) and adaptable (e.g.,
weighted 1.0) state-pairs. Arbitrarily weighting flexibility as
one-half adaptability allows both approaches to changing
state-pairs to be evaluated. The choice of the weighting of
flexibility and adaptability as well as the weighting of
specific parameters (e.g., is physical layer adaptability more
or less important than higher layer adaptability) is closely
related to the intended use.