Impedance mismatch
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In electrical and electronic systems, an impedance mismatch infers an inefficient transfer of power. For time varying signals in an electrical or electronic system, an impedance mismatch can result in reflection of the signal back to the source - a potentially catastrophic situation. An impedance mismatch in software can have similar implications.
Where two or more software boundaries intersect, the interfaces exposed by these boundaries may not interact cohesively.