I've got an issue about stress & fatigue.
1) Each physical characteristic can take fatigue, each mental characteristic can take stress. But which one exactly ?
When you take fatigue while attempting an action based on a characteristic, the tested characteristic take one or more fatigue or stress. But what about the other situations where rules says "you take one stress, one fatigue" without further details ? (I.E. : additionnal manoeuver during your turn, failed first aid/terror/fear check, etc...) How do you chose the appropriate affected characteristic ? It seems it's only a GM choice based on logical, but I may miss something...
2) Furthermore, don't you feel it's a bit complicated to follow stress/fatigue count for each characteristics... ?
As Toughness and Willpower are the major characteristic concerning health, we asked ourselves if it wouldn't be better to put fatigue on Toughness for every fatigue earned, and Willpower on every stress earned. The problem is this option modifies the rule balances.