@Fireflygamer
you can read more about this in the
gather resources tutorial page but basically, when gathering each notcat rolls a dice of 0-20, and the higher the modifier is the higher the minimum number they can roll is.
so for example a cat with +7 will role at least an 8, whereas a notcat with -5 will role a minimum -4 (they can still both role 20)
each job has specific personality and stats that will increase the modifier, which are written in the assign job page