What percentage of the Development Team's capacity is appropriate for Product Backlog refinement?

The appropriate percentage of the Development Team's capacity allocated for Product Backlog refinement is generally considered to be "not more than 10%". This guideline suggests that while refining the Product Backlog is important, it should not consume a significant amount of the Development Team's time, as their primary focus is on delivering increments of the product.

Product Backlog refinement is an ongoing process where the Development Team collaborates with the Product Owner to clarify and break down backlog items, ensure they are understood, and make them ready for future sprints. Allocating around 10% of the team's capacity allows them enough time to engage in this activity without detracting from actual development work. It recognizes the need for balancing refinement with the primary responsibilities of delivering potentially shippable increments of the product.

This percentage is aligned with Scrum principles, which emphasize the importance of collaborative work between the Development Team and the Product Owner while maintaining a strong focus on delivering value.