<Li> Neighbour: the adjacent level / ranking (the immediate superior and immediate inferior) </Li> <Li> Interaction: the relationship between an object and its direct superior or subordinate (i.e. a superior / inferior pair) <Ul> <Li> a direct interaction occurs when one object is on a level exactly one higher or one lower than the other (i.e., on a tree, the two objects have a line between them) </Li> </Ul> </Li> <Ul> <Li> a direct interaction occurs when one object is on a level exactly one higher or one lower than the other (i.e., on a tree, the two objects have a line between them) </Li> </Ul> <Li> a direct interaction occurs when one object is on a level exactly one higher or one lower than the other (i.e., on a tree, the two objects have a line between them) </Li>

What is the structure of methods and principles that a society uses