The High Lords of Terra are in charge. Just that. The Emperor may be above them, but only in a symbolical sense, like many of the monarchies of europe. He is, for all intents and purposes, dead. A religious saint/god. There is more to him than that, but to explain how the government functions, that is sufficient.ACman said:Edit: I mean technically the "High Lords of Terra" are supposed to be in charge? How in charge?
This is the extent of the explanation:
Of which three or four seem to be layers of government and the rest seem to be military or paramilitary.
EDIT: A little more on the High Lords - they are an oligarchy, basically, and their office is something you rise to politically within your career branch. Each High Lord has an area of expertise. I can't remember all of them, but there is a master of the feelt, a master of the assasins, and so on.Basically, one for each major/important branch of Imperial society.
As for the chart...
The ones I have underlined in read are military branches. Those in yellow are closely affiliated, but not actual military branches.
I am also almost 100 % sure that that isn't an official chart. For one thing, it is missing a branch of the Inquisition.