In PRINCE2, issue management and change control are closely related, where issue management is considered a subset of change control. Change control is a broader process that encompasses all aspects of managing changes within the project, including issues that might impact the project's scope, timescales, costs, or quality. Issue management specifically deals with resolving issues that can affect the progress of the project.References: (PRINCE2 7 Foundation Handbook, AXELOS)

The objectives of the 'managing a stage boundary' process include confirming to the project board that there are no products outstanding for the stage (1) and requesting the project board to approve work to start on the next stage (4). These objectives ensure that each stage is properly concluded before moving to the next, maintaining project governance and alignment with planned objectives.References: PRINCE2 7 Foundation materials on the 'managing a stage boundary' process.

The purpose of the quality theme in PRINCE2 is to define and implement the means by which the project will ensure that all products are fit for purpose and meet their requirements. This theme is essential for planning, designing, developing, and delivering products that satisfy the customer's expectations and standards defined for the project.References: = PRINCE2 7 Foundation handbook and online resources