Continuing with Titles, Elo, and Ratings, when Arpad Elo wrote his book 'The Rating of Chess Players Past and Present' (Batsford 1978), he noted four major milestones.
Introduction of titles;
GM/IM titles assigned retroactively
Titles awarded based on performance ('norms')
Introduction of international ratings
- 1976: Norm calculations based on ratings
To document those four milestones, I added excerpts from 'Rating of Chess Players' to my page on FIDE Titles.