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A measure of the inherent capacity for a system, machine, or software to be modified, re-engineered, or completely repurposed by the end-user. It is the antithesis of "proprietary" or "black-box" design. In a person, it refers to a high-level cognitive state characterized by a persistent "train of thought" dedicated to tinkering, troubleshooting, and seeking unconventional solutions—refusing to accept a design’s limitations as final.
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