The valid priority values for user stories.

Only required, very important are items that are necessary to be implemented.

required: The story is required for the final product.

This and VERY_IMPORTANT are items necessary to be implemented.

very-important: The story is very important for the final product.

This and REQUIRED are items necessary to be implemented.

nice-to-have: The story is a nice-to-have for the final product, but not relevant for the release.

polishing: The story would add to the user experience of the user, but is not relevant for the release.

dispensable: The story is not necessary to be part of the release, but may be included if resources are available. If the product backlog contains only dispensable stores, the development is likely to come to an end.

The priority is available to keep stories in the product backlog for further references.