TPS Encyclopedia

Toyota's comprehensive shop floor management framework built on three pillars — Standardized Work, Ownership Maintenance, and Cutting Point Management — developed to codify the 'black box' of tacit supervisor knowledge into a teachable, assessable system with Bronze/Silver/Gold certification levels.

A systematic approach to workplace organization consisting of four practices — sort, set in order, sweep, and standardize — that creates the visual baseline required for abnormality detection and continuous improvement. Toyota traditionally practiced four S's; the fifth S (shitsuke/discipline) was added later as the framework spread outside Toyota.

A root cause investigation technique that traces a problem to its fundamental cause by repeatedly asking "why" — typically five times, though the actual number varies. Attributed to Taiichi Ohno as a core TPS discipline. Simple in concept but demanding in practice: each "why" must be answered with verified facts, not assumptions.

Seven fundamental quality analysis tools promoted by Kaoru Ishikawa for use by frontline workers and QC circles: Pareto chart, cause-and-effect diagram, check sheet, control chart, histogram, scatter diagram, and run chart. Designed to be simple enough that anyone on the shop floor can use them.

Taiichi Ohno's classification of seven forms of non-value-adding activity in production: overproduction, waiting, transport, over-processing, inventory, motion, and defects. Overproduction is the most critical because it generates all the others.

A structured problem-solving, proposal, and communication process — developed at Toyota in the late 1970s — that captures the entire PDCA cycle on a single A3-sized sheet of paper, serving simultaneously as a thinking discipline, a management coaching tool, and an organizational alignment mechanism.

An experiment in AI-assisted problem-solving report writing using well-documented historical source material.

The systematic approach to detecting, signaling, responding to, and resolving deviations from the defined standard — the management discipline that makes jidoka and visual management operational on the shop floor.

A visual signal system — typically an overhead board or light — that makes production status and abnormalities visible to supervisors and team leaders, enabling immediate response at the source of a problem.

The back-and-forth dialogue between management levels used to align goals, plans, and targets — ensuring that objectives set at one level are understood, challenged, and committed to at the next level before being finalized.

One of the five core values of the Toyota Way — forming a long-term vision, meeting challenges with courage and creativity, and maintaining the spirit to realize dreams through sustained effort rather than settling for the status quo.

One of the 7 QC Tools — a structured form designed for systematic data collection at the source. The simplest of the quality tools but arguably the most important: it forces disciplined, organized data collection before analysis begins, ensuring that subsequent tools like Pareto charts and histograms are built on facts, not impressions.

One of the 7 QC Tools — a time-series plot with statistically calculated upper and lower control limits that distinguishes between normal process variation (common cause) and abnormal variation (special cause). Invented by Walter Shewhart at Bell Labs in 1924 and brought to Japan by W. Edwards Deming.

Toyota's integrated system for managing product cost across the entire lifecycle — from target costing during development (genka kikaku), through kaizen costing during production, to cost maintenance for sustaining gains. The system treats cost as a design variable managed upstream, not an accounting outcome measured after the fact.

The third pillar of Toyota's 3 Pillar Activity — management of cutting tools, jigs, fixtures, and the tool-to-product interface at the point where quality is physically created, targeting first-shot accuracy and prevention of defects at their source.

The actual measured time required to complete one cycle of an operation — either the operator's complete work sequence or the machine's automatic processing time. Cycle time is observed and measured, not calculated from demand.

The structured daily routines and practices by which leaders at every level sustain standards, surface problems, and maintain stability — the management discipline that keeps a production system running between improvement cycles.

One of the 7 Wastes — producing parts or products that do not meet quality standards, requiring inspection, sorting, rework, scrap, or replacement. Every defect wastes the materials, labor, and machine time consumed in producing it, and risks reaching the customer.

Nephew of Sakichi Toyoda, cousin of Kiichiro Toyoda, and the leader who transformed Toyota from a small domestic manufacturer into a global industrial power (1913-2013). As president (1967-1981) and chairman (1981-1994), he provided the executive sponsorship that enabled Taiichi Ohno to develop and deploy the Toyota Production System across the company and its suppliers. His 1950 visit to Ford's Rouge plant convinced him Toyota could close the productivity gap with American manufacturers.

A system where the assembly line stops at a fixed position (the end of each work zone) rather than immediately when a problem is detected — giving the operator time to resolve the issue within their cycle while maintaining the discipline of jidoka.

The continuous movement of work through a production process without stoppages, batching, or waiting — the ideal state of JIT where each unit moves directly from one value-adding step to the next.

Toyota's integrated visual management and group leader development framework — a physical board that cascades company hoshin through layered KPIs down to daily shop floor activity, designed as much to develop supervisory capability as to manage results.

Toyota executive and global leader (1937-2023). Served as President (1999-2005) and Chairman (2006-2013) of Toyota Motor Corporation. A key figure in the global spread of the Toyota Production System, Cho learned TPS principles directly from practitioners trained by Taiichi Ohno. He played a central role in Toyota's North American manufacturing operations and led the codification of The Toyota Way in 2001 -- the formal articulation of Toyota's management philosophy for a global workforce.

The actual place where work is performed and value is created. In Toyota management philosophy, truth and understanding are found by going to the genba — not by reading reports or studying data in an office. The correct Japanese spelling is "genba" (現場), not the common Western corruption "gemba."

The actual product, part, or physical thing itself — as opposed to a report, data, photograph, or description of it. In Toyota's management philosophy, understanding comes from examining the genbutsu directly, not from secondhand representations.

The practice of going to the actual place (genchi) and observing the actual thing (genbutsu) to understand the real situation — not through reports, data summaries, or secondhand accounts, but through direct, firsthand observation. A foundational management discipline at Toyota.

The practice of honest, often painful self-reflection on what went wrong, what was learned, and what must change — not to assign blame, but to develop the individual and prevent recurrence. A deeply embedded cultural discipline at Toyota and in Japanese society.

The practice of leveling both the volume and mix of production over a fixed period of time, creating a predictable and repeatable pattern that absorbs demand variation without passing it upstream to suppliers and internal processes.

One of the 7 QC Tools — a bar chart showing the frequency distribution of measured data, revealing the shape, center, spread, and any abnormalities in process output. Makes visible whether data clusters symmetrically, skews to one side, has multiple peaks, or spreads beyond specification limits.

A strategic management method — rooted in PDCA thinking — that aligns an organization vertically and horizontally around a few breakthrough objectives, using a disciplined two-way dialogue (catchball) between levels to connect senior leadership intent with frontline reality. Not top-down goal cascading but a living management system.

One of the 7 Wastes — excess raw materials, work-in-process, or finished goods beyond what is needed to serve immediate customer demand. Inventory ties up capital, consumes space, and most critically hides problems that would otherwise force improvement.

One of the 7 QC Tools — a structured diagram that organizes potential causes of a quality problem into categories branching from a central spine, resembling a fish skeleton. Created by Kaoru Ishikawa at the University of Tokyo in the early 1950s for use by QC circles.

One of the two pillars of the Toyota Production System — the principle of building quality into the process by enabling machines and people to detect abnormalities and stop immediately, preventing defects from flowing downstream.

A hands-on group study activity where managers and engineers go to the shop floor to study and improve actual processes — learning TPS by doing, not by classroom instruction. Jishuken was a primary method Toyota used to develop TPS capability in its suppliers.

A four-step method for teaching a person to do a job correctly, safely, and conscientiously — developed in the U.S. during World War II, transferred to Japan during the occupation, and deeply embedded in Toyota's approach to operator training.

A structured four-step method for improving how a job is done — by breaking the job into details, questioning every detail, developing a new method, and applying it — developed as part of the TWI program and adopted at Toyota as a foundation for systematic improvement.

A four-step method for handling people problems in the workplace — based on the principle that a supervisor's results depend on the people they work with, and that good relations are built by treating people as individuals and handling problems early with facts.

One of the two pillars of the Toyota Production System — the principle of making only what is needed, when it is needed, in the amount needed, by synchronizing every process to the rate of customer demand.

The practice of continuous, incremental improvement by every person, every day — not a special event but the daily discipline of working from a standard, finding problems, and establishing a better standard.

A card-based audit system where managers draw cards representing specific standards, processes, or areas to check — ensuring that audits cover all critical items over time through randomized or scheduled rotation rather than relying on memory or personal preference.

A physical card or signal that authorizes the production or movement of a specific part in a specific quantity — the operational mechanism that makes Just-in-Time possible on the shop floor.

Structured practice routines for developing scientific thinking habits — repeating a pattern of grasping the current condition, establishing a target condition, experimenting, and reflecting until the pattern becomes second nature.

Toyota engineer and the company's first chief engineer (主査, shusa) for vehicle development (1913-1998). Nakamura led the development of the original Toyopet Crown, Corona, and Century, and created the project general manager system that became Toyota's signature approach to product development. He also built Toyota's 2,000-ton Clearing press and pioneered early gas turbine hybrid research.

Son of Sakichi Toyoda, engineer, and founder of Toyota Motor Corporation (1894-1952). He conceived the just-in-time production concept, led the transition from textiles to automobiles, and built the Koromo Plant that became the birthplace of the Toyota Production System. His resignation during the 1950 labor crisis — accepting personal responsibility for layoffs — established a leadership ethic that still defines Toyota.

The total elapsed time from the initiation of a process to its completion — typically from customer order to delivery, or from raw material entry to finished goods shipment. Lead time is the customer-facing measure of how responsive a production system is.

Toyota's original method for diagramming the complete flow of materials and information through a production system — the practice that was later popularized outside Toyota as "value stream mapping" by the Lean Enterprise Institute.

A dedicated material delivery person who follows a fixed route on a timed cycle, supplying parts and materials to production operators so they never have to leave their stations — named after the water beetle that moves quickly across the surface.

A Japanese concept encompassing the total process of making things with skill, care, and dedication — not just manufacturing technique but the spirit, pride, and craftsmanship that goes into creating excellent products.

One of the 7 Wastes — unnecessary movement by operators during work: walking, reaching, bending, turning, searching for tools or parts. Rooted in the Gilbreths' motion study tradition and their 17 therbligs, this waste targets human movements that do not directly transform the product.

Any activity that consumes resources without creating value for the customer. At Toyota, muda is one of three interrelated categories — alongside mura (unevenness) and muri (overburden) — that define the targets for elimination in TPS.

Unevenness or irregularity in workload, volume, or pace — the fluctuations that create alternating periods of overburden and waste. At Toyota, mura is often the root cause that must be addressed before muda (waste) and muri (overburden) can be sustainably eliminated.

Overburden or strain placed on people, machines, or processes beyond their reasonable capacity — leading to breakdowns, safety problems, quality defects, and burnout. At Toyota, muri is one of three interrelated categories of loss alongside muda (waste) and mura (unevenness).

The practice of building consensus through informal, one-on-one discussions with stakeholders before a formal decision or proposal is presented — ensuring alignment, surfacing objections early, and enabling smooth approval without surprise opposition.

A dedicated physical room where cross-functional team members gather to manage a project or program — making status, problems, and decisions visible on the walls so that alignment and rapid problem-solving happen face-to-face.

A small, elite internal group within Toyota Motor Corporation — originally called the Production Research Division (生産調査室) — staffed by Taiichi Ohno's disciples. OMCD's role was to codify TPS thinking, spread TPS to Tier One suppliers through jishuken activities, and develop internal leaders through short rotational assignments. The group's impact was primarily external to Toyota, in the supplier base.

The ideal state of flow production where each unit is processed and passed to the next operation one at a time, with no batching or WIP accumulation between steps.

A single-page visual teaching document focused on exactly one topic — one quality check, one safety point, one operating procedure — designed to be created quickly and used for brief, focused training at the workstation.

Toyota's shop floor drawing documenting the stock removal, dimensions, tolerances, datum locations, and clamping details for each individual machining operation — the critical intermediate reference that makes plan-vs-actual comparison possible at every step in a machining line.

One of the 7 Wastes — performing work beyond what the customer requires or what the product specification demands. This includes using overly precise equipment, adding unnecessary finishes, conducting redundant inspections, or processing materials in ways that add cost without adding value.

The most critical of the 7 Wastes — producing more, sooner, or faster than the next process requires. Uniquely emphasized by Taiichi Ohno as the root waste that generates all others: excess inventory, unnecessary transport, hidden defects, and idle waiting.

The second pillar of Toyota's 3 Pillar Activity — operators clean, inspect, and check their own equipment daily to detect small defects early and prevent breakdowns, taking ownership of equipment condition rather than leaving all maintenance to specialists.

One of the 7 QC Tools — a bar chart that ranks problem categories by frequency or impact in descending order, with a cumulative percentage line, to identify the "vital few" causes that account for the majority of a problem. Based on the Pareto principle introduced to Japan by Joseph Juran.

The foundational iterative cycle for improvement and problem solving — Plan a change, Do (implement) it, Check the results, Act to standardize or adjust. Brought to Japan by W. Edwards Deming in 1950 and deeply embedded in Toyota's management system as the thinking discipline behind all improvement.

A device or mechanism that either prevents a human error from occurring or detects it immediately after it happens, making it impossible for defects to flow to the next process. Originally called "baka-yoke" (fool-proofing), the name was changed after a worker objected to the implication.

A structured PDCA-based method for investigating problems where the problem itself is clear but the root cause is unknown — scrap issues, recurring defects, equipment reliability gaps. PPS follows the same 8-step logic as Toyota Business Practice (TBP) and was the earlier name for this process before TBP was formally adopted around 2005.

A calculation form that determines the production capacity of each machine or process in a line — including manual time, machine time, and tool change allowances — to identify the bottleneck process and establish whether the line can meet takt time.

A whiteboard at each production area that tracks planned versus actual output hour by hour, making production status and problems visible in real time so leaders can respond immediately.

A specific type of kanban card that authorizes a process to produce a defined quantity of a specific part — the "make" signal in Toyota's pull system, as distinct from the withdrawal kanban that authorizes movement.

A production control method where downstream processes withdraw only what they need from upstream processes, using consumption as the signal to replenish — the opposite of forecast-driven push production.

A small group of frontline workers who meet regularly on a voluntary basis to identify, analyze, and solve quality and workplace problems using the 7 QC tools and structured problem-solving methods.

Toyota's operation-level quality standard specifying the precision measurements, tolerances, measuring instruments, sampling methods, and judging criteria for verifying part quality at each machining step — the technical reference that production and QC use to measure quality at the process level.

One of the two pillars of the Toyota Way (alongside continuous improvement) — the principle that the company develops its people, trusts them to solve problems, and creates systems that make their work meaningful and sustainable.

A formal circulation-and-approval document used at Toyota and across Japanese organizations to gain cross-functional sign-off on projects, capital expenditures, or policy changes before they proceed — a written form of nemawashi.

Son-in-law of Sakichi Toyoda and the first president of both Toyoda Automatic Loom Works (1926) and Toyota Motor Co., Ltd. (1937). Originally from the Kodama family, he married into the Toyoda family and brought financial and business management expertise that complemented the engineering focus of Sakichi and Kiichiro. He served as president of Toyota Motor from its founding in 1937 until 1941, when Kiichiro succeeded him.

One of the 7 QC Tools — a simple time-series plot tracking a single metric over time, with data points connected by lines. Reveals trends, shifts, and cycles in process performance without the statistical complexity of a control chart. Often the first chart used to verify whether an improvement action worked.

Inventor, industrialist, and founder of the Toyota industrial group (1867-1930). His automatic loom innovations — particularly devices that stopped the machine when a thread broke — gave birth to jidoka (autonomation), one of the two pillars of the Toyota Production System. The sale of his loom patents to Platt Brothers of England provided the seed capital for Toyota Motor Corporation.

One of the 7 QC Tools — a plot of paired data points on an X-Y axis that reveals whether two variables are related. Used to test hypotheses about cause-and-effect relationships identified during fishbone analysis — for example, whether furnace temperature correlates with hardness defects.

A tool storage board with painted outlines (shadows) showing the designated location of each tool — making it instantly visible when a tool is missing, out of place, or not returned.

Japanese industrial engineer (1909-1990) who taught productivity improvement courses at Toyota for roughly 30 years and authored influential books on manufacturing methodology including SMED and poka-yoke.

Sales executive and businessman (1898-1980). Founding president of Toyota Motor Sales Co., Ltd. and the architect of Toyota's nationwide dealer network. Known as the "God of Sales" (販売の神様), Kamiya established the customer-first philosophy and multi-channel distribution system that made Toyota's commercial success possible. His famous dictum -- "Customers first, dealers second, manufacturer last" -- became a foundational principle of Toyota's business culture and complemented the production-side innovations of the Toyota Production System.

Toyota's system of assigning a single senior engineer total accountability for a vehicle program — concept, quality, cost, and market success — while deliberately withholding line authority over the functional engineers who do the work. The shusa integrates the entire vehicle through technical depth, drawing sign-off power, and direct engagement rather than rank.

A triangular-shaped kanban used for batch processes (such as stamping or molding) where one-piece flow is not feasible — it signals the process to produce a batch when inventory in the supermarket drops to a calculated reorder point.

A visual grid showing each operator's qualification level for each process in a work area — making it immediately clear who can do what, where training gaps exist, and how flexible the team is for rotation and coverage.

A systematic method for reducing equipment changeover time to single-digit minutes (under 10 minutes) — enabling smaller production lot sizes, more frequent changeovers, and greater production flexibility.

A diagram drawn on a floor plan that traces the actual movement path of an operator, material, or document through a process — revealing wasted motion and unnecessary transport that are invisible in standard process documentation.

The use of statistical methods — particularly control charts — to monitor process stability, distinguish between common-cause and special-cause variation, and maintain processes in a state of statistical control so that quality is built into the process rather than inspected after the fact.

The prerequisite foundation of the TPS House — the condition where the 4Ms (Man, Machine, Material, Method) are sufficiently reliable and consistent that flow, pull, and continuous improvement can function. Without stability, advanced TPS techniques collapse.

The currently agreed-upon best method for performing a task — defined by takt time, work sequence, and standard in-process stock. Standard work is not fixed forever; it is the baseline from which improvement begins.

A visual shop floor document that defines the three elements of standardized work for a given process: takt time, work sequence, and standard in-process stock. Includes a floor layout diagram showing the operator path through the work cycle.

A time-study chart that maps the detailed relationship between an operator's manual work time, walking time, and machine automatic cycle time across a full work cycle — used to design multi-machine operations where one operator runs several processes within takt time.

The machine tool precision record submitted after run-off and process capability qualification — documenting spindle run-out, axis travel accuracy, and other static measurements that establish the machine's baseline condition independent of material, tooling, and cutting conditions.

A controlled inventory buffer between two processes where each item has a defined location and quantity — the downstream process withdraws what it needs, and the withdrawal triggers replenishment from the upstream process, implementing pull at the point where continuous flow is not possible.

Production engineer and executive at Toyota Motor Corporation (1912-1990). Universally recognized as the principal architect of the Toyota Production System (TPS). Over roughly two decades from the late 1940s through the 1960s, Ohno developed the integrated system of just-in-time production, kanban, continuous flow, multiprocess handling, and waste elimination that transformed Toyota and, eventually, global manufacturing. His 1978 book Toyota Production System: Beyond Large-Scale Production remains the foundational text on TPS.

Toyota engineer who led the development of the first-generation Prius as chief engineer (1994-1997), pioneering the obeya (big room) method to manage the unprecedented cross-functional challenge of hybrid technology. Later served as Toyota Chairman (2013-2023). Born 1946.

The rate of customer demand expressed as a time interval — how often the customer needs one unit. Takt time is the heartbeat of a lean production system, synchronizing every process to the pace of actual demand.

An overhead or line-side display that shows the takt time, elapsed time in the current cycle, and production count — making the pace of production visible to everyone on the line so operators and leaders can see immediately whether the process is on pace.

A product development discipline where the allowable cost of a new product is determined from the target selling price minus the required profit — then decomposed into cost targets for every subsystem, which the chief engineer manages through tradeoffs and value engineering. Cost is designed in, not controlled after the fact.

Aeronautical engineer turned Toyota chief engineer (1916-2008). Hasegawa served as sub-chief under Kenya Nakamura on the first Toyopet Crown, then led development of the Publica, Sports 800, Corolla, Celica, and Carina as chief engineer (shusa). He codified the chief engineer system into a scalable organizational practice, introduced target costing (genka kikaku) to Toyota product development, and established the Product Planning Office in 1965.

Toyota's formal 8-step problem-solving method, codified in 2001 as the standardized approach for all Toyota employees worldwide. TBP is PDCA made explicit in eight structured steps, designed to develop scientific thinking capability across the organization.

Toyota's shop floor diagram specifying the tooling manufacturer, tool number, dimensions, and placement for each position on a machine — the reference standard for verifying that the correct tools with the correct specifications are installed correctly.

Toyota's codification of its management philosophy, built on two pillars — Continuous Improvement and Respect for People — first formalized in an internal document in 2001 by Fujio Cho to preserve and transmit the company's values as it globalized.

A comprehensive equipment management system that involves all employees — especially production operators — in maintaining equipment to achieve zero breakdowns, zero defects, and zero accidents, moving beyond reactive repair to proactive care.

The structural diagram representing the Toyota Production System as a house — with Just-in-Time and Jidoka as the two pillars, stability as the foundation, and the goal of highest quality, lowest cost, and shortest lead time as the roof.

One of the 7 Wastes — the unnecessary movement of materials, parts, or products between processes. Every time material is picked up, moved, set down, or handled without being transformed, that movement is pure waste. Transport adds cost and time but never adds value.

The ideal state that guides the direction of all improvement — zero defects, zero breakdowns, zero inventory, zero accidents, 100% value-adding activity. True North is deliberately unattainable, serving as a permanent compass heading rather than an achievable target.

A visual diagram that maps the complete flow of material and information from supplier to customer for a product family — showing every process step, inventory point, information flow, and time delay to reveal where waste exists and where improvement should focus.

A management philosophy — not merely a set of tools — in which the status of every process, the location of every item, and the presence of every abnormality is made immediately visible to anyone on the shop floor, without requiring explanation, reports, or computer screens.

One of the 7 Wastes — idle time when people stand watching machines, wait for parts from upstream, wait for equipment repair, or wait for information. The Japanese term temachi literally means "hands waiting," emphasizing that capable workers are standing with nothing to do.

A specific type of kanban card that authorizes the movement of parts from a supermarket or upstream process to a downstream process — the "move" signal in Toyota's pull system, as distinct from the production instruction kanban.

A detailed document that breaks down each task in a process into its individual work elements, recording the time, key points, and reasons for each element — the foundational building block of standardized work.

The broad category of documents that define how work is performed across all departments — maintenance, engineering, quality, production preparation, and more. Work standards are not standardized work. The majority of documented standards in a Toyota factory are work standards, not standardized work.

A stacked bar chart that visualizes work element times for each operator in a process, making it immediately visible which operators are over or under takt time and where rebalancing is needed.

The systematic practice of sharing improvements, lessons learned, and countermeasures horizontally across the organization — ensuring that a solution developed in one area benefits all similar areas, and that problems solved once are not solved again elsewhere.