How do the Training Perks Work?

[rcoll]

Recently I've been wondering how exactly the special training perks seem to be automagically added to the player when they increase their stats through other means such as bobbleheads or the console.

 

I'd assume that this would be done through the Story Manager SkillIncrease Event being sent whenever the player's stats increase, but that event node seems to have been removed in Fallout 4.

Now I'm just thinking: How does the game know when your stats change? How does it track them? I haven't found any documentation that says anything about tracking actor values, so I'm asking the community if they might know anything that I don't.

Edited January 31, 2018 by rcoll