Abbreviated SZ
Size adds its dice value to Strength. Note the original ST before the Size adjustment; there are cases where this will matter.
Size adds its value to Endurance for physical damage. Size is NOT a factor in determining exhaustion.
Size subtracts from Dexterity. For every +2 in Size, subtract 1 dice from DX. (Conversely for every -2 in SZ, add +1 to DX).
Size cannot be developed in the same way as other Stats – it is solely determined by mass.
Humans, assuming a weight of 100-250 lbs (#) are size 0.
Humans or humanoids of Size greater than +3 are implausible within regular Earth gravity, and would require some sort of explanation (magic, robot, magical robot, whatever).
Bigger:
Smaller: