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The principle of object-activity (activity with objects) performs a heuristic function only when it enables one to discover an object of inquiry and a plane of theoretical movement that otherwise would remain inaccessible. But no principle and no program of investigation based on it can be evaluated in terms of its theoretical potential merely by analyzing the facts within the framework of such a program; the particular program must be critically compared with others that do not employ this principle, or do so in a fundamentally different version.
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