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import coupling comparison table
Subject use by cause has definition have disadvantage be is a kind of reduce by
coupling  A measure of the extent to which interdependencies exist between software modules hard to assesssoftware quality 
import couplingJavaa system to suddenly fail if a new item is added to an imported file, and this new item has the same name as something you have already defined in your subsystemA form of coupling in which one component declares that it imports (makes use of the definitions in) anotherif the imported component changes something on which the importer relies, or adds something that raises a conflict with something in the importer, then the importer must changea weaker form of inclusion couplingcouplingnot importing packages or classes which you do not need

Next couplinginclusion coupling    Upcoupling    Previous couplingexternal coupling