5. Manage Product Backlog

The product backlog is the fundamental source of information for a Scrum team. The product backlog consists of all the doing. It can be broken down to three identure levels:

Epic
An epic arranges the backlog items. In pure Scrum there are no epics but it can make sense to introduce epics in large products.
Backlog item
A backlog item maps generally to a requirement.
Task
A task is assigned with exact one team member. A task is assigned with exact one backlog item. A backlog item consists at least of one task.