Learning ServiceNow

Assigned to and Assignment group

The Assigned to [assigned_to] field is a reference field type that points to the Users [sys_user] table. This field is generally used to designate a user to work on, or be responsible for the task. By default, this field has a reference qualifier (role=itil) set on its dictionary record that prevents any non-itil user from being assigned to a task. You can override this reference qualifier on tables that extend task though, as the Project Task and Service Order tables do, if you have the relevant plugins installed.

The Assignment group [assignment_group] field serves pretty much the same purpose. The reason for having both, is that a workflow might automatically assign a certain type of task ticket to a group, ...