1. Method Name

Spaghetti Diagram

2. Alternative Names

Layout Diagram, Transportation Diagram

3. Brief Description

A spaghetti diagram is a simple visual tool used to track and record the physical movement of people, materials, or information within a workplace. The resulting diagram often resembles a plate of spaghetti, which is where its name comes from.

4. Purpose / When to Use

It is used to identify and quantify waste in the form of unnecessary motion and transportation. It is ideal for analyzing and optimizing the layout of a workspace, whether it is a production cell, an office, a warehouse, or a hospital ward.

5. Procedure / How to Apply It

1. Draw a floor plan: Create a simplified but dimensionally accurate sketch of the space being analyzed. Include all relevant elements: machines, tables, shelves, doors, printers, etc.
2. Select an object to track: Decide what you will track—the movement of a specific worker, a cart with materials, a document, a patient, etc.
3. Track and draw: Take your floor plan, a stopwatch, and a pencil. Track the selected object during one complete cycle (e.g., production of a single unit, processing of a single invoice) or during a specified time period (e.g., 1 hour). Draw a continuous line that traces the exact path of movement.
4. Analyze the diagram
:- Quantify the distance: Measure the total length of the drawn line and convert it to actual distance.
- Identify anomalies: Look for places where the lines intersect the most, where there are long movements, or frequent returns to the same spot.
5. Design a new layout: Work with your team to design a new workplace layout that minimizes distances and streamlines the workflow. Place frequently used tools and equipment as close together as possible and in a logical sequence.
6. Create a new diagram: After implementing the changes, draw a new spaghetti diagram to visually and quantitatively confirm the improvement.

6. A Real-World Example

A nurse at the hospital complained of fatigue. The department manager decided to use a spaghetti diagram to map her movements during a two-hour sample collection period. The diagram revealed that the nurse walked a total of 1.2 km, repeatedly traveling back and forth between patient rooms, the supply closet, and the sample processing room. After analyzing the data, the team moved the most frequently used supplies to a mobile cart and changed the order in which the rooms were visited. The new diagram showed a 60% reduction in the distance traveled.

7. Benefits

- Extremely simple: All you need to create it is paper, a pencil, and a stopwatch
.- Strong visual impact: The chaotic “spaghetti” diagram is immediately understandable to everyone and clearly communicates the existence of a problem
.- Engages employees: It’s a great team activity that directly involves the team in analyzing and improving their own work
.- Provides quantitative data: It allows you to precisely quantify how much time and energy is wasted on unnecessary movement.

8. Risks / Limits

- Limited scope: It shows only physical movement. It does not show other types of waste (waiting, overproduction, errors).
- Snapshot: It shows the situation only at the time of observation. If the process changes, the diagram may not be representative
.- “Hawthorne effect”: The person being observed may temporarily change their behavior (work more efficiently) because they know they are being watched.
- It may be perceived as surveillance: It is important to explain that the goal is to improve the process, not to monitor or evaluate an employee’s performance.

9. Practical Tips

- Use different colors: If you are observing multiple people or types of material on a single floor plan, use a different color for each one.
- Record a video: Recording the process on video and then playing it back in fast forward can reveal movement patterns that aren’t apparent during normal observation.
- Combine with other tools: A spaghetti diagram is an excellent starting point for discussing 5S or creating standardized work.
- Don’t forget the office: This tool is also extremely effective for analyzing movement in administrative processes (e.g., trips to the printer, scanner, or archive).