Lecture 5: Principles of Lean- Value Stream Mapping Flashcards
What is a Value Stream Map?
A graphical representation of the entire value stream which includes material, information, and product flow
What should be included in a Value Stream Map
All of the actions that are required to take a product or service from order to delivery
Who developed VSM?
Toyota
What are the benefits of a Value Stream Map? (7)
- Graphically represents the total value stream
- Provides shared understanding in a common language
- Highlights waste
- Visualizes flow and connection of Lean techniques
- Identifies process bottlenecks
- Improves the bigger picture instead of individual processes
- Forms the basis for continuous improvement
What are the 4 levels of the value stream?
- Process
- Single Plants
- Multiple Plants
- Across companies
What are the 3 principles for creating a VSM?
- Needs to be on 1 sheet of paper
- Use the standard symbols for the diagram
- Walk around, understand and validate the process
What 4 things do you need for creating a VSM?
- Sheet of A0 paper
- Pencils
- Calculator
- Post-it notes
What are the 5 steps of value stream mapping?
- Determine product family to set scope
- Draw the process flow map
- Add the material and information flow
- Add data in the data collection boxes
- Add process data and lead data
How do you calculate the Processing time
Add all the process times
How do you calculate the inventory time?
Inventory (parts) / output per day
What does PLT stand for?
Process Lead Time
How do you calculate the PLT?
Processing time + Inventory time
OR
Work in progress/ exit rate per time unit
What is PCE?
Process cycle efficiency
How do you calculate PCE %?
Value added time / PLT * 100%
What 3 things does the value stream map include?
- Information flow
- Material flow
- Timeline
