Which are NOT appropriate topics for discussion in a Sprint Retrospective?

The Sprint Retrospective is an opportunity for the Scrum Team to inspect itself and create a plan for improvements to be enacted during the next Sprint. The topics that are appropriate for discussion are those that relate to how the team does its work, such as processes, tools, communication, collaboration, quality, etc. The value of work currently represented in the Product Backlog and arranging the Sprint Backlog for the next Sprint are not appropriate topics for discussion in a Sprint Retrospective, as they belong to the Sprint Review and Sprint Planning events respectively.