'''Tithe Grade''', also named the '''Grand Harvesting''' or '''Terra's Due'''{{Fn|2}} refers to the amount of materials an Imperial world must supply to the [[Administratum]]. The size of the tithe depends on the type of world it is applied to. A tithe can be any form of material: food, weapons, minerals, people, etc.. Despite the number of agencies tracking tithes, due to the sheer size of the Imperium and the difficulty of [[Warp]] travel makes time consuming process of tithe collection riddled with confusion and inefficiency.{{Fn|2}}