A Spaghetti Diagram is a simple drawing that traces the physical path of an operator, a part or a document through a workspace. Its name comes from the tangled appearance the lines usually produce, a visual proof of how much motion waste is embedded in a process that has never been mapped.
Sketch the physical layout of the area. Follow one operator (or one part) for one full cycle, drawing a line every time they move. Every stop, backtrack and detour becomes visible on the paper. Ten minutes of observation typically produces a diagram that no one in the room can defend.
Distance walked per cycle, often surprisingly large. Crossings where paths intersect and workers get in each other's way. Tools stored far from where they're used. Materials that travel back and forth between stations. Fixtures placed on the wrong side of the workstation. Each pattern is a specific opportunity for redesign.
Redesign the layout to shorten the longest lines. Move tools and materials to the point of use. Reorganize the workstation so the natural motion is the productive motion. Then draw the diagram again to verify that the improvement is real. The best follow-up diagrams look almost empty by comparison.
The spaghetti diagram is one of the cheapest and most persuasive lean tools. A single sheet of paper and a stopwatch expose motion waste that has been invisible for years, and the improvement it prompts almost always pays back immediately in shorter cycle times and less operator fatigue.
