Which Lean tool can help visualize bottlenecks in a process?

The Spaghetti Diagram is a Lean tool specifically designed to visualize the flow of materials and information in a process. It provides a graphical representation of all the routes taken during a process, helping identify areas where movement is excessive or inefficient. By mapping out the actual paths taken, it becomes easier to spot bottlenecks, redundancies, or unnecessary movement that can cause delays. The term "spaghetti" reflects the typically tangled and convoluted paths that can emerge in a process, making it an effective way to highlight opportunities for improvement.

In contrast, other options serve different purposes. A Gantt Chart is primarily used for project scheduling and tracking progress over time. A Process Flow Diagram outlines the steps of a process but may not explicitly highlight areas of inefficiency. A Pareto Chart is utilized to identify the most significant factors contributing to a problem by displaying data in descending order of impact, but it doesn't visualize bottlenecks in the same way that a Spaghetti Diagram does.