AGMA Standard 11 0.01 was first published in October 1 943 as means to document the
appearance of gear teeth when they wear or fail. The study of gear tooth wear and failure
has been hampered by the inability of two observers to describe the same phenomenon in
terms that are adequate to assure uniform interpretation. AGMAStandard 11 0.02 became a
national standard, B6.1 2, in 1 954. A revised standard with photographs, AGMA 11 0.03,
was published in 1 960. The last version, AGMA 11 0.04, was published in 1 979 and
reaffirmed by the members in 1 989, with improved photographs and additional material.