A Gantt chart (Answer A) is a project management tool that provides a visual timeline of tasks, deadlines, and milestones. It is especially useful for getting a team back on track by clearly outlining what needs to be done, when, and by whom. In the context of a rapid cycle improvement team that has stalled, a Gantt chart can help refocus the team’s efforts, ensure accountability, and track progress towards completing assignments and conducting tests of change.

The other tools are valuable but serve different purposes:

Ishikawa diagram (B), also known as a fishbone diagram, is used to identify the root causes of a problem.

Spaghetti diagram (C) is used to map out the physical movement in a process to identify inefficiencies.

Value stream map (D) is used to analyze the flow of materials and information through a process, focusing on value creation.