Whether you're building your own world or using Golarion you will eventually come across the need to make an organization. Whether you're looking to create a theives' guild, religious order, bardic college, or something akin to the pathfinder society there are some things you need to think about when making the group to fill your game.
How many organizations do you usually create in your world/ What kind of hierarchies have they used? What initiation requirements do they have? Have your player's sought to build organizations within your game?
