An interesting older thread about this: http://forum.topeleven.com/top-eleve...o-you-use.html

When I first started playing I kept a notebook that included training results, mostly so I could see who was worth training and how, along with age of player to see how they slow down. I no longer bother, as I've been playing so long I can guesstimate training results pretty accurately for my Team now, and I can easily tell how far they are from their next star.

Ratings.. some people think are worthless (and I ignore my GK's now) but I do think tracking that is important indicator of how a player is performing, and what competitions they do better in (some players like CL more than League, etc.) But I also think you can try adding training points differently to improve their rates, although there is still the odd "dud" player than just doesn't work in one's team.