During the ISO development period the Calibration Committee decided that supplemental
information, on measurementsystem conditionsforcalibration, accuracyrequirementsand
uncertainty determination, was desirable to have in an AGMA Information Sheet. This
resulted in the publication of AGMA 931 –A02, Calibration ofGear Measuring Instruments
and Their Application to the Inspection ofProduct Gears, in 2002.
The ISO documents expanded the AGMAwork and included material on the determination
of uncertainty of measurement and the introduction of spherical calibration artifacts. The
natural evolution, therefore, was the adoption ofthe two comprehensive ISO documents as
national documents in place of the four AGMA documents.