However, here is a about the guide, including its purpose, structure, and how you can legally obtain or access the PDF. ISO/IEC Guide 98-4:2012 – Uncertainty of measurement – Part 4: Role of measurement uncertainty in conformity assessment Overview ISO/IEC Guide 98-4 is a critical supplement to the Guide to the Expression of Uncertainty in Measurement (GUM). While GUM Parts 1–3 explain how to calculate measurement uncertainty, Part 4 addresses a practical and high-stakes question: When a measurement result is near a specification limit, how do you decide if a product passes or fails? Scope The guide provides rules and procedures for using measurement uncertainty in conformity assessment — i.e., deciding whether an item (product, component, material) meets a given requirement or tolerance.
I cannot directly provide or link to a PDF copy of ( Uncertainty of measurement — Part 4: Role of measurement uncertainty in conformity assessment ) due to copyright restrictions. ISO documents are commercially protected.