  In this paper, the problem of communication over an essentially unknown
channel, which is known to be able to communicate a source to a destination to
within a certain distortion level, is considered from a behavioral,
interconnection view-point. Rates of reliable communication are derived and
source-channel separation for communication with fidelity criteria is proved.
The results are then generalized to the multi-user setting under certain
assumptions. Other applications of this problem problem which follow from this
perspective are discussed.
