In security, we can define users and groups as shown in previous how tos. In addition we can define relationships between users.
Using relationships we can define:

		Line management hierarchy;
		Current project manager assignments;
		HR representives for each staff member;
		etc.

Relationships therefore provide a flexible way to express common organisational structures.

In this example we will start by building up a line management hierarchy on the users defined in user management. Then we will introduce a new relationship type, "Project management", and assign some users as project managers.