Higher ordered Product Backlog items are usually clearer and more detailed than lower ordered ones. More precise estimates are made based on the greater clarity and increased detail; the lower the order, the less detail. Product Backlog
items that will occupy the Development Team for the upcoming Sprint are refined so that any one item can reasonably be “Done” within the Sprint timebox. Product Backlog items that can be “Done” by the Development Team within one Sprint
are deemed “Ready” for selection in a Sprint Planning.