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A system, which implements persistent objects, has to provide differentopportunities to change the objects in arbitrary ways during their existence. Atraditional realization of OO paradigm in modern programming systems hasfundamental drawbacks which complicate an implementation of persistentmodifiable objects considerably. There is alternative realization that does nothave these drawbacks. In the article the PROGRESS operation is offered, whichmodify existing object within an existing inheritance hierarchy.

On PROGRESS Operation. How to Make Object-Oriented Programming System More Object-Oriented (DRAFT)