We all know what impacts prospect development. What impacts coach development? Is it random? You could have two identical coaches starting in rookie ball, one guy gets +4s and 5s, the other only +3s. It’s one part of this game I’ve never been able to figure out.

I think it's just by season, with rating improvement rate based on the starting point.

I did too, but I did some AB testing - same level, experince and rating - and some guys just develop better. I wonder if it’s a hidden rating

I haven’t looked at this systematically, but my theory from experience is that coaches are just like players: they have different starting points and different ceilings, and they progress at different though somewhat predictable rates.

Young inexperienced coaches will often add 3-4 points to their IQ ratings, while older ones progress more slowly. After a certain amount of time they stop growing, just like players do. But it definitely does vary by individual. AFAIK there isn’t any way to speed up or slow down coach improvement, but if anyone knows differently, please share!