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Peter Williams Lount addresses what Birdman's Land calls OO's Achilles Heel:

"When everyone defines their own objects, then all [Object Oriented programming] does is bog you down trying to convert between two mismatched items."

I don't think this problem is specific to OO at all; it's a general domain level problem that has cropped up in many places (how many people have tried to define a generic "Person" object or data structure, for instance?). Peter's got a long dissertation on that subject; have a look