ISO 8015 is far more than a technical document; it is a declaration of engineering maturity. By replacing the implicit, often wasteful Envelope Principle with the explicit, functional Principle of Independency, it empowers designers to specify exactly what they require, manufacturers to produce parts efficiently, and inspectors to measure unambiguously. It acknowledges that modern parts—from injection-molded plastic clips to machined aerospace brackets—do not need to conform to an ideal, perfect envelope unless that envelope is functionally necessary. In a world demanding both precision and economy, ISO 8015 provides the rational, flexible, and rigorous foundation upon which clear technical communication is built. For any engineer seeking to produce drawings that are not just clear, but legally and functionally definitive, understanding and applying ISO 8015 is not optional—it is essential.