Free SAFe® 5 DevOps: VSM Questions and Answers — Questions and Answers

Question 1: VSM is a technique that corresponds to

Other kaizen
System kaizen
Point kaizen
Process Kaizen (Correct answer)

Correct answer: Process Kaizen

Value Stream Mapping (VSM) is a lean manufacturing technique specifically designed for analyzing and improving the flow of materials and information within a process. It is a powerful tool for 'Process Kaizen,' focusing on continuous improvement within a specific value stream by identifying and eliminating waste. VSM helps visualize the entire process to pinpoint inefficiencies.

Question 2: VSM is a technique for illustrating information and material flow.

FALSE
TRUE (Correct answer)

Correct answer: TRUE

Value Stream Mapping (VSM) is fundamentally a visual tool used to illustrate the entire flow of a product or service from beginning to end. It explicitly maps out both the material flow, which details the steps involved in transforming raw materials into a finished product, and the information flow, which represents the data and communication that guide the material flow. This comprehensive visualization helps identify delays and waste.

Question 3: VSM displays

Lead time
Information flow (Correct answer)
Shopfloor management
Material flow (Correct answer)
KPIs (Correct answer)

Correct answer: Information flow

Value Stream Mapping (VSM) is a comprehensive visualization tool that explicitly displays several key aspects of a process. It maps out the 'Information flow' (how data and communication move) and the 'Material flow' (how products or services move through the steps). Additionally, VSM often includes 'KPIs' (Key Performance Indicators) like lead time, processing time, and inventory levels for each step to highlight areas for improvement and waste.

Question 4: Each product flow is typically recorded separately using VSM.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

Value Stream Mapping (VSM) is most effective when it focuses on a single product family or a specific value stream, rather than recording each individual product flow separately. The goal is to identify common processes and shared resources across similar products to optimize the entire flow. Mapping every single product variation independently would be impractical and less insightful for identifying systemic improvements.

Question 5: VSM is primarily employed in the subsequent level:

Whole supply chain
Complex enterprise
Single process
One plant (from door to door) (Correct answer)

Correct answer: One plant (from door to door)

Value Stream Mapping (VSM) is typically employed at the 'one plant (from door to door)' level to analyze and improve the entire process within a specific facility. While it can inform broader supply chain strategies, its detailed focus on material and information flow, processing times, and inventory levels makes it most effective for optimizing operations within a defined organizational boundary like a single plant or department.

Question 6: What is the focus of VSM?

Interconnection of the processes (Correct answer)
Quality methods
Material flow
Efficient changeover
Ergonomy of the workplace (Correct answer)

Correct answer: Interconnection of the processes

The primary focus of Value Stream Mapping (VSM) is to understand and improve the 'interconnection of the processes' within a value stream, visualizing how work flows between different steps. By mapping the entire process, VSM aims to identify all forms of waste, including those that might stem from poor 'ergonomy of the workplace,' as inefficient movements or setups can lead to delays, defects, or unnecessary effort, all of which impede efficient flow.

Question 7: What is the purpose of a typical Gemba walk?

Make immediate changes in the process
Understand high-level production process (Correct answer)
Identify waste (Correct answer)
Introduce kaizen on the shop floor
Discuss the problem in the meeting room

Correct answer: Understand high-level production process

A Gemba walk is a lean management practice where leaders and teams go to the actual place where work is performed ('Gemba' means 'the actual place'). Its primary purpose is to 'understand the high-level production process' by observing it directly and to 'identify waste' (Muda) in real-time. This direct observation helps uncover inefficiencies and problems that might not be apparent in a meeting room.

Question 8: For the future state VSM, it should be kept if the current VSM displays a push system.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

In Value Stream Mapping (VSM), a key principle for designing the future state is to transition from push systems to pull systems. If the current VSM displays a push system, where work is pushed to the next step regardless of readiness, the future state VSM should aim to implement a pull system. This change reduces inventory, improves flow, and enables earlier detection of issues, meaning a push system should not be kept.

Question 9: The separation of processes by substantial inventory enables a faster and more efficient material flow.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

The separation of processes by substantial inventory, often characteristic of batch production, actually hinders faster and more efficient material flow. Large inventories mask problems, increase lead times, and tie up capital, making it difficult to identify bottlenecks and quality issues quickly. Lean principles advocate for reducing inventory and connecting processes with minimal buffers to achieve smoother, more efficient flow.

Question 10: Batch production permits earlier identification of a quality issue than piece-by-piece production.

TRUE
FALSE (Correct answer)

Correct answer: FALSE

Batch production, by processing large quantities of items at once, means that if a quality issue occurs early in the batch, it may not be discovered until much later, after many defective items have been produced. In contrast, piece-by-piece (or one-piece) production allows for immediate detection of quality issues, as each item is inspected or processed individually. This enables faster corrective action and prevents the accumulation of defects, making the statement false.

Question 11: The resolution range of suggested modifications and enhancements implied by VSM should fall within...

Months
Weeks (Correct answer)
Years

Correct answer: Weeks

The suggested modifications and enhancements identified through Value Stream Mapping (VSM) are typically intended for relatively quick implementation. The goal is to achieve tangible improvements rapidly, often within 'weeks,' rather than months or years. This aligns with the iterative nature of lean practices, allowing for continuous momentum and demonstrating the benefits of process improvements quickly.

Question 12: The synchronization of the production process is not displayed by VSM.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

Value Stream Mapping (VSM) is specifically designed to display and analyze the synchronization of the production process. By mapping out all steps, their processing times, lead times, and inventory levels, VSM clearly illustrates how well (or poorly) different processes are synchronized. It highlights areas where processes are out of sync, leading to bottlenecks, waiting, and other forms of waste, making the statement false.

Question 13: How is takt determined?

Available operating time / Daily demand (Correct answer)
Material volume / OEE
Daily demand / EPEI
EPEI * Daily demand
Daily demand / Available operating time

Correct answer: Available operating time / Daily demand

Takt time is a crucial concept in lean manufacturing, representing the rate at which products need to be completed to meet customer demand. It is calculated by dividing the 'Available operating time' (the total time available for production) by the 'Daily demand' (the number of units required by the customer per day). This calculation ensures production is precisely synchronized with customer needs.

Question 14: Connecting processes through a single piece flow lengthens lead time.

FALSE (Correct answer)
TRUE

Correct answer: FALSE

Connecting processes through a single-piece flow (or one-piece flow) is a core lean principle designed to *shorten* lead time, not lengthen it. By moving one item at a time between processes with minimal or no buffers, single-piece flow drastically reduces work-in-process inventory, allows for quicker identification of defects, and accelerates the overall flow of value to the customer. Therefore, the statement is false.

Question 15: The connection between two processes with comparable cycle times is achieved most effectively by

Inventory
One Piece Flow (Correct answer)
Supermarket
FIFO

Correct answer: One Piece Flow

When two processes have comparable cycle times, the most effective way to connect them and ensure smooth, efficient flow is through 'One Piece Flow.' This method minimizes inventory between the processes, significantly reduces lead time, and makes problems immediately visible. By moving one item at a time, it ensures continuous flow and prevents the accumulation of work-in-process.

Question 16: The best way to connect two processes with different cycle times is by

One Piece Flow
FIFO
Supermarket (Correct answer)
Inventory

Correct answer: Supermarket

In SAFe and Lean, a 'supermarket' (or Kanban buffer) is used to decouple processes with different cycle times. It holds a controlled amount of inventory, allowing the upstream process to produce at its own pace and the downstream process to pull items as needed. This prevents bottlenecks and ensures smooth flow without overproduction, effectively connecting processes with varying speeds.

Free SAFe® 5 DevOps: VSM Questions and Answers

VSM is a technique that corresponds to