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.