The Kanban approach is used to make system improvements using visualization and by controlling work in progress. This method focuses on visualizing tasks through a Kanban board and managing the flow of work by limiting work in progress, which helps teams identify bottlenecks and improve efficiency. Other options describe different methodologies: option B describes an iterative timeboxed approach used in Agile frameworks, option C pertains to the Lean Startup approach, and option D describes the Scrum framework.