Toyota Production System (TPS) & Lean Manufacturing: Comprehensive Exam Review

Comprehensive practice flashcards synthesizing core principles, Japanese methodologies, quality systems, and operational problem solving across all eight TPS lecture modules.

Where does the Toyota Production System (TPS) primarily focus its efforts to eliminate waste (Muda)?

TPS focuses directly on the conversion and operating activities within the internal process itself, establishing standardized, stable processes that inherently deliver defect-free outputs.

From whose perspective must value and waste strictly be defined under TPS?

Value and waste must be defined strictly from the customer's perspective; any activity the customer is unwilling to pay for or that does not enhance fitness for use is waste.

How did the central philosophy of TPS challenge the traditional mass manufacturing view regarding quality and cost?

TPS broke the traditional trade-off by proving that organizations can improve product quality without an increase in cost, because eliminating process waste prevents downstream defects and rework.

What is the operational definition of "Overprocessing" in Lean manufacturing?

Overprocessing means taking unnecessary processing steps, applying overly tight tolerances, or providing specifications that exceed what the customer actually values or requires.

What are the four components of the "4P" model of the Toyota Production System?

Philosophy (long-term thinking), Process (continuous flow and waste elimination), People & Partners (respect and development), and Problem Solving (continuous learning and root-cause analysis).

What is "Heijunka" and what operational issues does it address?

Heijunka is the leveling of production volume and product variety over a given period, smoothing schedules to eliminate operational unevenness (Mura) and worker or machine overburden (Muri).

How did Chief Engineer Ichiro Suzuki approach Noise, Vibration, and Harshness (NVH) during the development of the Lexus LS400?

Rather than following the traditional industry compromise of adding heavy damping mass to the vehicle structure, the engineering team manufactured engine and drivetrain components to unprecedented tolerances to eliminate noise and vibration at the source.

What does Takt time represent, and what is its operational purpose in Lean production?

Takt time represents the rate of customer demand ($\text{Available Operating Time} / \text{Customer Demand}$) and sets the heartbeat of the manufacturing cell to pace production and avoid overproduction or stockouts.

Which primary pillar of the TPS house is responsible for continuous process flow, pull-based signaling, and integrated logistics?

The Just-In-Time (JIT) pillar.

What is the core concept of "Jidoka" (autonomation) in TPS?

Jidoka refers to equipment endowed with human intelligence to work autonomously, detect abnormalities or defects, and automatically stop production to allow immediate root-cause analysis and preventive maintenance.

Which of the seven classic wastes is directly eliminated by operating a pull system rather than a push system?

Overproduction—the most fundamental form of waste in TPS—because upstream processes only produce what downstream processes consume.

What are the distinct definitions of the three Japanese operational terms Muda, Muri, and Mura?

Muda is non-value-added waste; Muri is the overburdening of personnel or equipment beyond operational capacity; Mura is unevenness or variation in demand and production flow.

Why does Toyota avoid laying off employees during business downturns for a specific product?

Its decisions are guided by long-term philosophy and systems thinking that view workers as vital long-term assets whose problem-solving capability is essential for continuous improvement.

According to Toyota Way Principle 8, what defines "reliable technology"?

Thoroughly tested technology that directly serves people and processes, rejecting unproven or trendy technologies that risk disrupting continuous flow or process stability.

In Jeffrey Liker's Toyota Way leadership model, what combination of traits characterizes a "Builder of a learning organisation"?

A combination of bottom-up coaching management and deep specialist or domain expertise.

What is the meaning and practical requirement of "Genchi Genbutsu"?

It translates to "go and see for yourself," mandating that leaders go directly to the actual place of work (Gemba) to deeply observe the situation and base decisions on verified shop-floor facts.

How does Toyota define "respect for suppliers" under Principle 11?

Setting high, challenging performance expectations while treating suppliers fairly, building long-term mutual trust, and actively teaching them Lean manufacturing techniques.

How does TPS interpret the highest level of Maslow's hierarchy of needs (Self-Actualization)?

By developing worker self-reliance, capability, and intrinsic pride in craft through active empowerment in continuous improvement (Kaizen) and scientific problem solving.

What does the Japanese term "Nemawashi" represent in the context of TPS management?

Laying the groundwork, discussing options, and building consensus across all affected departments prior to making a formal decision, enabling thorough alignment and rapid execution.

What are the specific operational meanings of Seiri, Seiton, and Seiso in the 5S methodology?

Seiri is sorting out and discarding unnecessary items; Seiton is systematic arrangement so essential items are easily accessible; Seiso is scrubbing, shining, and sweeping while inspecting for abnormalities.

Which landmark book popularized the concept of the "Learning Organization," and who authored it?

The Fifth Discipline: The Art & Practice of The Learning Organization, published in $1990$ by Peter Senge.

Why should the initial application of Lean tools begin with repetitive processes rather than unique processes?

Repetitive processes have predictable flow, making it easier to establish standardized work, demonstrate clear early wins, and stabilize baseline operations before tackling complex, low-volume tasks.

What does the "Product Life Cycle" evaluate within the framework of Green Manufacturing?

It adopts a comprehensive "cradle-to-grave" perspective that evaluates the total environmental impact of a product across raw materials sourcing, manufacturing, distribution, use, and end-of-life disposal or recycling.

What is "Waste-to-Profit" (byproduct synergy or industrial symbiosis)?

A sustainable operating model in which the waste or byproduct of one production process is captured and reused as a valuable raw material input for another process or enterprise.

How do Flexible Manufacturing Systems (FMS) impact factory floor space requirements?

FMS results in a net reduction in required floor space by optimizing machine layouts, minimizing work-in-progress inventory, and creating compact, continuous work cells.

What is the defining characteristic of "Non-competitive benchmarking"?

Benchmarking specific operational processes against non-competing firms or cross-industry leaders, allowing open knowledge transfer without trade secret concerns or competitive barriers.

What are the two primary operational performance dimensions delivered by Lean production?

Cost reduction (achieved by systematically eliminating Muda) and Quality improvement (achieved through Jidoka and error-prevention mechanisms).

Why is "faster innovation in products" excluded from the defining attributes of core Lean manufacturing culture?

Lean manufacturing culture centers specifically on process excellence, waste elimination (Muda), incremental improvement (Kaizen), and customer value creation, whereas rapid feature innovation belongs to Agile and product development methodologies.

What two interdependent streams does Value Stream Mapping (VSM) visually link across an operation?

Material flow (physical movement of raw parts to finished goods) and information flow (orders, production schedules, Kanban triggers, and control signals).

Why is overall lead time typically longer in a pull system compared to a traditional push system?

In a push system, items are pre-produced to forecast and can be delivered immediately off the shelf, whereas a pull system waits for a downstream consumption trigger before initiating production.

What percentage of total lead time in traditional manufacturing typically consists of non-value-added activities?

Over $90\%$ to $95\%$ of total lead time typically consists of non-value-added time, such as waiting, storage, transit, delays, and inspections.

What does the process mapping acronym "SIPOC" stand for?

Supplier-Inputs-Process-Output-Customers.

A shoe factory operates $5\,\text{days}$ a week in a single shift of $8\,\text{hours}$ per day with $1\,\text{hour}$ of total break time per shift. If weekly demand is $3{,}000\,\text{units}$, what is the ideal Takt time?

$42\,\text{seconds per unit}$. Operating time is $5 \times (8 - 1) = 35\,\text{hours/week} = 126{,}000\,\text{seconds}$; dividing by $3{,}000\,\text{units}$ gives $42\,\text{seconds/unit}$.

What is the operational difference between a Production Kanban (P-Kanban) and a Withdrawal Kanban (C-Kanban)?

A Production Kanban authorizes an upstream station to manufacture a specific quantity of parts, while a Withdrawal (Conveyance) Kanban instructs material handlers to transfer parts from upstream to a downstream work center.

What foundational premise does Eliyahu Goldratt's Theory of Constraints (TOC) establish regarding real-world systems?

Every system must have at least one constraint limiting its performance relative to its goal; otherwise, its operational throughput would be infinite.

A process has a downstream consumption of $150\,\text{parts/day}$, an overall lead time of $10\,\text{days}$, a safety stock factor of $15\%$, and a container capacity of $75\,\text{parts}$. How many Kanbans are required?

$23\,\text{Kanbans}$. Lead time demand is $150 \times 10 = 1{,}500\,\text{parts}$; safety stock is $15\% \times 1{,}500 = 225\,\text{parts}$; total inventory is $1{,}725\,\text{parts}$; dividing by $75\,\text{parts/container}$ yields $23\,\text{Kanbans}$.

What categories of recipients are recognized by the Deming Prize, established by the Union of Japanese Scientists and Engineers (JUSE) in $1951$?

The Deming Prize recognizes both individual experts who contribute significantly to Total Quality Management (TQM) theory and practice, as well as business enterprises that implement outstanding TQM programs.

Why is benchmarking not evaluated as an award criterion in the Malcolm Baldrige National Quality Award (MBNQA)?

Benchmarking is an operational measurement and improvement technique rather than one of the seven formal Baldrige award criteria categories (Leadership, Strategic Planning, Customer Focus, Measurement/Analysis, Workforce Focus, Operations Focus, and Results).