Manufacturing Industry Terminology
Additive Manufacturing (AM)
A family of processes that build parts layer by layer from digital models (e.g., polymer, metal powder-bed fusion, binder jetting). Used for prototypes, tooling, and increasingly for end-use parts, especially complex geometries.
“We’re using AM to 3D print fixture prototypes overnight.” “AM reduced our tooling lead time from weeks to days.” “Switching to AM cut weight by 30% on the bracket.”
Bill of Materials (BOM)
A structured list of all components, subassemblies, raw materials, and quantities required to build a finished product. May be single-level or multi-level, with revisions controlled by engineering.
“Update the BOM to reflect the new fastener size.” “The ERP exploded the BOM to generate component purchase orders.” “Engineering released a multi-level BOM for the assembly.”
Bottleneck
The process step or resource with the least capacity that limits the overall throughput of a production system. Managing the constraint is central to improving flow.
“The heat-treat oven is the bottleneck limiting throughput.” “We elevated the paint line to relieve the bottleneck.” “TOC analysis identified CNC #3 as the system constraint.”
CAPA (Corrective and Preventive Action)
A structured quality process to investigate root causes of nonconformities (corrective actions) and to eliminate potential causes before they occur (preventive actions). Integral to a QMS and often required by regulators.
“Open a CAPA to address the recurring leak test failures.” “The audit found weak verification of CAPA effectiveness.” “Our CAPA included design changes and operator retraining.”
Computer Numerical Control (CNC)
Automation of machine tools (mills, lathes, routers) via programmed instructions (e.g., G/M code). Enables repeatable precision and complex geometries with high productivity.
“We posted G-code to the CNC mill for the new job.” “CNC offsets were updated after the tool change.” “The 5-axis CNC enabled one-setup machining.”
Continuous Improvement (CI)
An ongoing, incremental effort to improve processes, quality, cost, and delivery. Often supported by Lean/TPS tools, daily management, and employee-driven problem solving.
“Our CI team runs monthly Kaizen events.” “Small daily CI wins reduced changeover by 20%.” “CI boards visualize ideas and actions at each cell.”
Cost of Goods Sold (COGS)
The direct costs attributable to producing goods that a company sells during a period. Reported on the income statement and used to assess gross margin and operational efficiency.
“COGS rose due to higher steel prices.” “Reducing scrap lowered COGS by 1.2%.” “COGS includes direct materials, labor, and factory overhead.”
Cycle Time
The elapsed time to complete one unit or one operation, including processing time and sometimes waiting within the step. Distinct from lead time (order-to-delivery).
“Trim press cycle time is 42 seconds per part.” “We mapped cycle time vs. takt time for each station.” “Automating inspection cut cycle time in half.”
Demand Forecasting
Estimating future customer demand using historical data, statistical models, and market inputs to drive planning (MRP, capacity, inventory, procurement).
“We use a hybrid of ARIMA and POS data for forecasts.” “Forecast error drove excess MTS inventory.” “Sales and Operations Planning reconciles demand forecasts with capacity.”
Design for Manufacturability and Assembly (DFM/DFA)
Design principles to simplify fabrication and assembly, reduce parts and complexity, ease tolerancing, and lower cost while maintaining performance and quality.
“DFM simplified the housing from four parts to one.” “DFA reduced fasteners, cutting assembly time 30%.” “Early DFM/DFA review prevented a tolerance stack-up issue.”
Digital Twin
A high-fidelity virtual model of a product, process, or system kept in sync with real-world data, used to simulate behavior, optimize performance, and support decision-making.
“We validated the new line layout in the digital twin.” “Sensor data syncs the digital twin to the physical asset.” “The twin predicted a throughput gain from buffer changes.”
Downtime
Periods when equipment or a line is not producing due to planned (changeovers, maintenance) or unplanned (breakdowns, shortages) causes. A key driver of OEE.
“Unplanned downtime was 5.2% due to jams.” “SMED reduced changeover downtime significantly.” “We track downtime by cause in the MES.”
Engineering Change Order (ECO)
A controlled document authorizing changes to product design, specifications, or process. Integrates with revisions, BOM updates, and change-effectivity planning.
“Release the ECO to update the BOM and drawings.” “The ECO requires disposition of existing WIP.” “ECO approvals include design, quality, and supply chain.”
Enterprise Resource Planning (ERP)
An integrated system that manages core business processes—finance, procurement, inventory, production, and order management—providing a single source of truth.
“ERP integrates BOMs, routings, and work orders.” “We moved from spreadsheets to ERP MRP runs.” “ERP ATP dates improved order promising.”
Failure Modes and Effects Analysis (FMEA)
A structured risk assessment identifying potential failure modes, their effects, causes, and controls, prioritizing actions (e.g., via RPN or Action Priority) to reduce risk.
“We prioritized high RPN items for mitigation.” “Process FMEA flagged a sealing risk at station 5.” “DFMEA drove a design change to lower severity.”
First Pass Yield (FPY)
The percentage of units that pass a process step or end-of-line test without rework. Indicates process effectiveness and quality at the source.
“FPY improved from 89% to 96% after tooling fixes.” “We track FPY by station to find hidden factories.” “Low FPY increased rework hours.”
Gage Repeatability and Reproducibility (Gage R&R)
A Measurement System Analysis to quantify variation from the measurement device (repeatability) and between appraisers (reproducibility), ensuring data is trustworthy.
“%R&R dropped below 10% after fixture upgrade.” “The MSA showed operator variability dominating.” “We ran a 3-operator, 10-part Gage R&R.”
Industrial Internet of Things (IIoT)
Networking of industrial assets, sensors, and control systems to collect, analyze, and act on data for improved visibility, efficiency, and maintenance.
“We stream vibration data via IIoT for PdM.” “IIoT sensors fed OEE dashboards in real time.” “Edge devices preprocess IIoT data before the cloud.”
Just-in-Time (JIT)
A production and inventory philosophy to make and move items only as needed, in the quantity needed, when needed—minimizing inventory and lead time.
“Daily milk runs enable JIT delivery to the line.” “JIT reduced WIP and floor space.” “We aligned supplier shipments to takt for JIT flow.”
Kanban
A visual pull system that signals replenishment based on actual consumption, controlling WIP and aligning production to demand (cards, bins, electronic signals).
“The two-bin kanban triggers replenishment at min stock.” “We replaced paper kanbans with e-kanban in the MES.” “Kanban sizing was recalculated after demand changed.”
Key Performance Indicator (KPI)
Quantifiable metrics that track performance against objectives (e.g., safety, quality, delivery, cost). Used for daily management and continuous improvement.
“OEE and FPY are core shop-floor KPIs.” “We set KPI targets in the Hoshin plan.” “KPI dashboards refresh hourly from the MES.”
Lean Manufacturing
A management system focused on maximizing value and minimizing waste (defects, overproduction, waiting, non-value processing, transport, inventory, motion, underutilized talent).
“Lean events eliminated motion and waiting waste.” “We implemented 5S and standard work in each cell.” “Lean flow cut lead time from 14 to 6 days.”
Line Balancing
Distributing work evenly across stations in a line so each meets takt time, minimizing idle time and bottlenecks to improve flow.
“We rebalanced tasks to meet a 60-second takt.” “Yamazumi charts exposed station overloads.” “Balancing reduced WIP queues between stations.”
Maintenance, Repair, and Operations (MRO)
The supplies, spare parts, tools, and activities needed to keep production assets running but not directly part of the finished product.
“We audited MRO spend on spares and lubricants.” “Critical spares were added to the MRO storeroom.” “MRO kitting cut tech travel time.”
Make-to-Stock (MTS)
A fulfillment strategy that builds products against forecast into finished-goods inventory, enabling immediate shipment but requiring forecast accuracy.
“High runners are MTS to maintain service levels.” “Incorrect forecast caused MTS excess inventory.” “We shifted a family from MTO to MTS after demand stabilized.”
Manufacturing Execution System (MES)
A shop-floor information system that manages production execution: scheduling, dispatch, data collection, quality checks, traceability, and performance.
“MES dispatches work orders and collects traceability.” “We use MES for electronic batch records.” “MES feeds real-time OEE to dashboards.”
Material Requirements Planning (MRP)
A planning method that explodes demand through the BOM using lead times and inventory to generate time-phased supply plans (planned orders, POs, jobs).
“The MRP run generated planned orders for week 34.” “We updated lead times to improve MRP signals.” “BOM errors caused MRP shortages.”
Mean Time Between Failures (MTBF)
A reliability metric for repairable systems representing the average operating time between inherent failures. Used with MTTR to plan maintenance and spares.
“MTBF improved to 1,200 hours post-rebuild.” “We plot MTBF trends by asset class.” “Low MTBF on pumps drove a redesign.”
Nonconformance (NC)
A product or process that does not meet specified requirements. Managed through containment, disposition (rework, scrap, use-as-is), and corrective action.
“An NCR was issued for out-of-spec dimensions.” “Quarantine NC material pending MRB disposition.” “We trend NCs by defect type for CI.”
Overall Equipment Effectiveness (OEE)
A composite metric equal to Availability × Performance × Quality, measuring how effectively equipment is used versus its full potential.
“OEE rose from 58% to 72% after TPM.” “Availability losses were mostly changeovers.” “We broke out A×P×Q to target the right losses.”
Poka-Yoke
Mistake-proofing devices or methods that prevent errors or make them immediately obvious to avoid defects.
“A go/no-go gage is a simple poka-yoke.” “We keyed the connector to prevent misassembly.” “Software poka-yoke blocks advancing without torque entry.”
Predictive Maintenance (PdM)
Condition-based maintenance using data (vibration, temperature, current, acoustics) and analytics to predict failures and plan interventions just-in-time.
“PdM flagged bearing wear from vibration spectra.” “We used oil analysis to schedule a gearbox swap.” “PdM cut unplanned downtime by 40%.”
Preventive Maintenance (PM)
Scheduled maintenance performed at set intervals or usage to prevent failures and extend asset life, complementing PdM and corrective maintenance.
“Quarterly PM includes alignment and filter changes.” “We optimized PM frequency using failure data.” “Skipped PMs caused premature failures.”
Process Capability (Cp, Cpk)
Statistical measures of how well a process can meet specifications. Cp compares spread to tolerance; Cpk accounts for both spread and centering.
“Cpk>1.33 met the customer requirement.” “Centering improved Cpk without changing Cp.” “We calculated capability after a stable SPC run.”
Programmable Logic Controller (PLC)
An industrial digital controller used to automate machinery. Programmed in ladder logic or IEC languages, interfacing with sensors, actuators, and HMIs.
“We updated the PLC ladder logic for the new sensor.” “A PLC fault halted the conveyor.” “PLC tags feed data to SCADA.”
Quality Management System (QMS)
The organizational structure, processes, and procedures for planning and executing quality policies and objectives, often aligned to standards (e.g., ISO 9001, IATF 16949).
“Our QMS is certified to ISO 9001.” “The QMS defines document control and CAPA.” “Process audits are part of the QMS calendar.”
Root Cause Analysis (RCA)
A systematic approach to identify the fundamental cause(s) of a problem so it can be eliminated, preventing recurrence.
“5 Whys led us to a missing torque spec.” “The fishbone diagram grouped potential causes.” “RCA actions included poka-yoke and training.”
SCADA (Supervisory Control and Data Acquisition)
A system for monitoring and controlling industrial processes, aggregating data from PLCs/RTUs, providing visualization, alarming, and historical logging.
“SCADA displays line status and alarms.” “We trended tank levels in SCADA’s historian.” “SCADA commands start/stop pumps remotely.”
Scrap Rate
The percentage of produced units or material that must be discarded because it fails to meet quality standards and cannot be reworked economically.
“Scrap rate fell from 4.5% to 2.1% after tooling repair.” “We track scrap by defect code and shift.” “High scrap increased COGS and missed shipments.”
Single-Minute Exchange of Dies (SMED)
A methodology to reduce changeover (setup) times to less than 10 minutes by separating internal and external tasks, streamlining, and standardizing.
“SMED cut press changeover from 90 to 12 minutes.” “We moved internal setup steps to external.” “Color-coding sped tool staging in SMED.”
Six Sigma
A data-driven methodology to reduce variation and defects using statistical tools within the DMAIC/DMADV frameworks, aiming for near-perfect quality.
“DMAIC reduced CTQ variation significantly.” “Black Belts led the gauge optimization project.” “We moved from 3.2σ to 4.1σ process capability.”
Standard Operating Procedure (SOP)
An approved, controlled document detailing the exact steps to perform a task consistently and safely, supporting compliance and quality.
“Operators must follow the torque SOP.” “We revised the SOP to include the new inspection step.” “Training verifies understanding of SOPs.”
Statistical Process Control (SPC)
Using statistical methods and control charts to monitor process stability, detect special-cause variation, and maintain control over time.
“X-bar/R charts caught a drift before out-of-spec.” “We calculated control limits after a stable run.” “An out-of-control signal triggered a setup check.”
Takt Time
The pace of production required to meet customer demand, calculated as available production time divided by demand. Used to align line capacity to demand.
“With 28,800 seconds/day and 480 units, takt is 60s.” “We sized staffing to meet takt time.” “Stations exceeding takt created queues.”
Theory of Constraints (TOC)
A management philosophy focusing on identifying and elevating the system’s constraint to maximize throughput while controlling WIP and operating expense.
“We subordinated non-bottleneck flow to the constraint.” “Buffer management improved throughput.” “DBR scheduling stabilized the line.”
Total Productive Maintenance (TPM)
A holistic approach to equipment reliability engaging operators and maintenance to eliminate the six big losses and improve OEE.
“Autonomous maintenance cleaned and inspected daily.” “TPM pillars drove OEE gains.” “We use OPLs to standardize TPM tasks.”
Value Stream Mapping (VSM)
A Lean tool to visualize material and information flow from supplier to customer, revealing waste and guiding a future-state design.
“The current-state VSM showed 4% VA time.” “Future-state VSM introduced supermarkets and pull.” “We used VSM to prioritize CI projects.”
Work in Process (WIP)
Partially finished goods within the production process. Managing WIP is key to lead time, flow, and inventory carrying cost.
“Excess WIP masked quality issues.” “We capped WIP with kanban limits.” “WIP aging reports highlighted bottlenecks.”
Yield
The percentage of good units produced versus total units processed. Can refer to first-pass yield, final yield, or rolled throughput yield across steps.
“Final yield was 97.2% after rework.” “Rolled throughput yield exposed hidden scrap.” “Improving first-pass yield raised overall yield.”
Zero Defects
A quality philosophy aiming for defect-free production by designing processes and systems that prevent or immediately detect errors.
“Zero defects is our assembly quality vision.” “Poka-yoke supports a zero-defect launch.” “We track near-misses toward zero defects.”
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