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2012
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
The production process of tractors manufacturing should provide for its regulation to ensure the given plant level of reliability. The higher reliability of the tractor, the more expensive its design and manufacture are. At the same time the costs of maintaining tractors in working condition are decreased. Contradictory nature of these costs allows to optimize the level of tractor's reliability.