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ISO 8015 declared that the Principle of Independency was dead. In its place, it established the —wait, no, the names are tricky. Let's clarify:
Actually, the old default was the "Envelope Requirement" (Taylor Principle). ISO 8015 did something radical: It said that . That is, each specification on a drawing stands alone . A size tolerance does NOT control form unless explicitly stated. A flatness tolerance does NOT control parallelism unless explicitly stated. iso 8015
This sounds like a minor tweak, but it was a tectonic shift. Suddenly, the drawing had to say everything. No more silent assumptions. The result: clearer communication, but also a massive increase in the number of tolerances on every drawing. ISO 8015 declared that the Principle of Independency
