What is a backlog?

A backlog in the context of agile development methodologies (such as Scrum) is an ordered list of tasks, requirements, user stories, and other elements that provide value to the product. It serves as a source of work for the development team and is constantly updated and prioritized.

There are two main types of backlog:

• Product Backlog: This is a dynamic, constantly changing list of all known tasks, features, improvements, and fixes that may be needed for the product. The product owner is responsible for its management, prioritization, and clarity. Items in the product backlog are usually represented as user stories but can also be in other formats.
• Sprint Backlog: This is a subset of items from the product backlog selected by the development team for implementation during the current sprint. The team is responsible for detailing and executing the tasks from the sprint backlog.

Main characteristics of the backlog:

• EPIC: Stands for Estimated, Prioritized, Insights, Continuously Refined. This mnemonic describes the key attributes of well-managed backlog.
• Prioritization: Items in the backlog are ordered by importance, value to the user and business, risk, and other factors. High-priority tasks are at the top of the list and ready for implementation soon.
• Detailing: Items at the top of the backlog are well elaborated and detailed so that the team can start working on them. Items at the bottom are more general and will be detailed later.
• Estimation: Each backlog item is assigned an estimate (e.g., in Story Points), reflecting the relative or absolute complexity and volume of work.
• Iterativeness: The backlog is never static. It is constantly replenished with new tasks, existing ones are changed, removed, or reprioritized.

The backlog is a central artifact in Scrum, ensuring transparency and guiding the work of the team.