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Production Systems and Production Types (Exam Overview, MTO vs MTS, Cellular vs Line Production)

Production Management Planning Grade 3 生産管理プランニング (BC検定) · ビジネス・キャリア検定 生産管理プランニング3級 · Written by Tokutei Pass based on the official study texts; not copied verbatim.

1. Overview of Business Career Test Grade 3 Production Management Planning and Differences from Operations

The Business Career Test Grade 3 in Production Management Planning, administered by the Japan Vocational Ability Development Association (JAVADA), is an official qualification exam evaluating job knowledge related to production planning, design, and process control in manufacturing.

The exam uses a 4-option multiple-choice mark-sheet format with a total of 40 questions (25 specialized knowledge questions + 15 common knowledge questions), a time limit of 110 minutes, and a passing standard of 60% or higher out of 100 points (at least 24 correct answers).

This exam qualifies as a requirement for transitioning to Specified Skilled Worker (i) to (ii) in manufacturing fields (basic materials, industrial machinery, and electrical/electronic/information industries), and foreign test-takers can select the Ruby-annotated question booklet (exam code 041B02) with furigana on all kanji.

While Grade 3 Production Management Operations focuses on shop-floor execution, equipment maintenance, and materials/inventory handling, Grade 3 Production Management Planning emphasizes upstream functions: product planning, design management, VE, production planning, MRP, and line balancing.

Key points


  • Exam specifications = 4-option multiple choice, 40 questions total (25 specialized + 15 common), 110 minutes duration, passing score 60% or higher (24+ correct answers).

  • Qualifies for Specified Skilled Worker No. 2 (3 manufacturing fields) and offers a full-furigana ruby question booklet (code 041B02).

  • Operations tests shop-floor manufacturing, maintenance, purchasing, and logistics practice, whereas Planning tests product planning, design, VE, production planning, and line organization.

  • Example: Total 40 questions (100 points max, 2.5 points each), passing standard 60%, exam time 110 min → Minimum correct answers to pass = 40 × 0.60 = 24 questions (60 points), average time per question = 110 ÷ 40 = 2.75 min
WordMeaning
Grade 3 Production Management Planning (041B01, Ruby version 041B02)
Specialized Knowledge (25 questions) and Common Knowledge (15 questions)
Specified Skilled Worker No. 2 (3 Manufacturing Fields)

2. Flow of Corporate Activities, Logistics Systems (Procurement, Production, Sales, Recovery), and Material Handling

Corporate activities in manufacturing begin with (1) Product planning to capture market needs, proceeding through (2) Product design → (3) Production preparation and process design → (4) Material procurement and manufacturing (mass production) → (5) Sales and after-sales service.

The logistics system supporting this physical flow is divided into four domains: Procurement logistics (purchasing raw materials and parts from suppliers and transporting them to the plant) and Production logistics or internal logistics (moving and storing work-in-process between processes inside the plant).

Furthermore, there are Sales logistics (delivering finished goods to distribution centers or customers) and Recovery logistics or venous logistics (collecting used products, empty containers, pallets, and returns for recycling or proper disposal).

In addition, all handling operations such as transporting, loading/unloading, storing, and sorting raw materials, work-in-process, and finished goods inside factories and warehouses are called Material Handling (Matehan), utilizing conveyors and AGVs (Automated Guided Vehicles) to save labor.

2. Flow of Corporate Activities, Logistics Systems (Procurement, Production, Sales, Recovery), and Material Handling

Key points


  • Basic sequence of corporate activities: (1) Product planning → (2) Design → (3) Production preparation (process design, equipment arrangement) → (4) Manufacturing (mass production) → (5) Sales.

  • Four logistics domains: Procurement logistics (parts delivery), Production logistics (in-plant movement), Sales logistics (customer shipment), Recovery logistics (reverse/venous logistics).

  • Material Handling (Matehan) = Handling technology for moving, loading/unloading, storing, and picking items within production sites and warehouses.
WordMeaning
Product planning, Design, Production preparation, Mass production
Procurement logistics, Production logistics, Sales logistics, Recovery logistics
Material Handling (Matehan)

3. Objectives of Production Management (QCD and PQCDSME), 6 Management Activities, and PDCA / SDCA

A production system is a mechanism that takes inputs of the 3Ms—Man, Machine, and Material—along with Method and Information, transforms and processes them, and outputs high-value-added products.

The primary objective (three major goals) of production management is QCD optimization: supplying products of Quality (Q) that satisfy customers, at low Cost (C), and according to the promised Delivery date (D) and quantity.

Furthermore, on the shop floor, as secondary objectives supporting QCD, companies comprehensively enhance PQCDSME by adding Productivity (P), Safety (S), Morale (M), and Environment (E).

The six major factory management activities are Process control (delivery and quantity), Work management (standard operations and time), Equipment management (maintenance), Materials & purchasing management, Quality control, and Cost control—driven by both SDCA to maintain standards and PDCA to improve targets.

Key points


  • Primary objective of production management = Optimal achievement of Quality (Q), Cost (C), and Delivery (D) (with P, S, M, and E added as secondary objectives).

  • Six management activities: Process control, Work management, Equipment management, Materials & purchasing management, Quality control, and Cost control.

  • Daily standard maintenance uses SDCA (Standardize → Do → Check → Act); problem-solving and level-up improvement use PDCA (Plan → Do → Check → Act).
WordMeaning
QCD (Quality, Cost, Delivery) and PQCDSME
Process, Work, Equipment, Materials/Purchasing, Quality, and Cost Management
SDCA cycle for maintenance and PDCA cycle for improvement

4. Make-to-Order vs Make-to-Stock Comparison, and BTO / ATO (Decoupling Point)

Depending on the timing between receiving customer orders and starting production, systems are classified into Make-to-Stock and Make-to-Order. Make-to-Stock (MTS) produces finished goods in advance based on demand forecasts, holds them in inventory, and ships immediately from finished goods stock when orders arrive.

Make-to-Stock offers extremely short delivery lead times to customers and reduces manufacturing cost through planned mass production; however, forecast errors create risks of unsold goods (excess inventory) or stockouts (lost sales opportunities), and it cannot accommodate custom specification changes.

Conversely, Make-to-Order (MTO) begins design, material procurement, and manufacturing only after receiving a formal customer order (specifications, quantity, delivery date). There is no risk of unsold finished goods inventory and custom specifications can be met, but delivery lead time becomes long.

A hybrid approach combining both is BTO (Build to Order / Assemble to Order: ATO). Standardized common parts and modules (semi-finished subassemblies) are produced to stock based on forecasts, and final assembly is performed after receiving an order—achieving both short delivery times and diverse customization.

4. Make-to-Order vs Make-to-Stock Comparison, and BTO / ATO (Decoupling Point)

Key points


  • Make-to-Stock (MTS) = Holds finished goods inventory based on demand forecasts (short delivery lead time, but carries excess inventory risk from forecast errors).

  • Make-to-Order (MTO) = Starts design and manufacturing after order confirmation (no finished goods inventory risk, but long delivery lead time and large load fluctuations).

  • BTO (Build-to-Order) = Holds common parts and units in inventory via forecast production (decoupling point) and performs final assembly after order receipt.
WordMeaning
Make-to-Stock (MTS) and Make-to-Order (MTO)
BTO (Build to Order) / ATO (Assemble to Order)
Decoupling point (boundary between forecast-driven and order-driven stages)
Delivery lead time and inventory risk

5. Classification by Product Variety and Volume (Low-Mix High-Volume, Medium-Mix Medium-Volume, High-Mix Low-Volume)

Viewed by the combination of product variety and production volume, production types are classified into three categories: (1) Low-mix high-volume production, (2) Medium-mix medium-volume production, and (3) High-mix low-volume production.

Low-mix high-volume production manufactures large quantities of a limited variety of standard products (beverages, daily necessities, basic chemicals, standard screws, etc.). Automated lines with dedicated equipment are easy to set up, and operation standardization and learning effects greatly reduce unit cost.

High-mix low-volume production manufactures small quantities of diverse custom-specified products per customer (custom industrial machinery, molds/dies, prototypes, etc.). General-purpose machines and skilled multi-functional workers take center stage, making detailed scheduling, progress control, and setup time reduction critical.

Medium-mix medium-volume production lies between the two (machine tools, construction machinery, home appliances, etc.) and uses modularization of common parts and Group Technology (GT: grouping similar parts for processing) to achieve mass-production efficiency despite high product variety.

Key points


  • Low-mix high-volume = Suited for make-to-stock and dedicated lines; achieves high equipment utilization and low unit cost, but has low flexibility to demand changes.

  • High-mix low-volume = Suited for make-to-order and general-purpose equipment; flexible to specification changes, but prone to frequent setups, transport, and waiting.

  • Medium-mix medium-volume = Balances product diversity and production efficiency through parts commonality (modularization) and Group Technology (GT).
WordMeaning
Low-mix high-volume, Medium-mix medium-volume, and High-mix low-volume production
Dedicated machinery and General-purpose machinery
Group Technology (GT: aggregating similar parts)

6. Classification by Work Flow Continuity (Job/Individual Production, Lot Production, Continuous Production)

By the temporal continuity of work flow, production is classified into Individual (job) production, Lot (batch) production, and Continuous production. Individual production manufactures products with different designs per order one unit at a time, such as ships, large bridges, power plants, and custom dies.

Lot production (intermittent production) alternates multiple product types on the same machines or lines; it produces a grouped quantity (lot) for one product type, performs a setup change (changing dies or jigs), and switches to the next product type.

In lot production, making the lot size too large reduces setup frequency but swells work-in-process and finished goods inventories; conversely, small-lot production shortens inventory and lead time but increases setup frequency, making setup time reduction essential.

Continuous production continuously flows the same product type without interruption over long periods—such as oil refining, steelmaking, cement, beverages, and mass-produced appliances—where maintaining inter-process balance and preventive equipment maintenance are top priorities.

Key points


  • Individual production = Manufactures unique products one item at a time per order (shipbuilding, large plants, custom molds/dies, etc.).

  • Lot production = Repeats production in fixed batch quantities (lots) per product type while performing setup changes on the same equipment.

  • Continuous production = Continuously produces low-mix high-volume identical products without interruption over long periods on dedicated equipment/lines.
WordMeaning
Individual production, Lot production, Continuous production
Lot size and Setup / Changeover
Small-lot production and Single-minute Exchange of Die (SMED)

7. Shop-Floor Production Methods (1): Job Shop vs Flow Shop, Single-, Mixed-, and Changeover-Model Lines

By machine layout and work flow, shop floors are divided into Job-shop type and Flow-shop type. A Job-shop layout (functional layout / machine-type layout) groups identical machines together—such as a lathe shop, milling shop, or welding shop—suiting high-mix low-volume individual production.

A Flow-shop layout (product layout / process-sequence layout) arranges machines and workstations in a line according to the product's processing and assembly sequence (line production), minimizing transport distance and work-in-process and suiting low-mix high-volume continuous production.

Line production is further divided into three types by the variety flowing on the line: first, a Single-model line (dedicated line) that continuously runs only one product type; second, a Changeover line (lot line) that performs setup changes to run different product types sequentially in lots.

Third is a Mixed-model line, which feeds multiple models sharing similar basic structures (such as different passenger car trims) mixed one by one onto the same line without setup changes, delivering powerful results in production leveling (Heijunka).

Key points


  • Job-shop type (functional / machine-type layout) = Groups general-purpose machines of the same kind, flexibly handling high-mix low-volume individual production.

  • Flow-shop type (product / process-sequence layout) = Line method arranging machines in processing order, minimizing transport and WIP in low-mix high-volume production.

  • Three line forms: Single-model line (dedicated to 1 item), Changeover line (lot production with setup changes), Mixed-model line (mixing multiple items without setup changes).
WordMeaning
Job-shop type (functional layout) and Flow-shop type (product layout)
Single-model line, Changeover line, Mixed-model line
Production leveling (Heijunka)

8. Shop-Floor Production Methods (2): Line Production vs 3 Cellular Production Methods (One-Person Stall, Chase/Circuit, Division)

In assembly shops, in contrast to Line production which finely divides single processes along a belt conveyor, Cellular production (cell production) is widely used: one or a small team of multi-skilled workers consistently handles assembly through inspection at a U-shaped workbench (cell or stall).

Cellular production flexibly adapts to high-mix low-volume production, demand volume fluctuations, and design changes, eliminates conveyor line-balancing waiting losses, and boosts worker responsibility and sense of achievement (morale).

Work allocation in cellular production has three methods: (1) One-person stall method (Hitori-yatai), where a single multi-skilled worker assembles all processes from start to finish alone within one cell.

(2) Circuit / Chase method (Rabbit-chasing method), where multiple workers each carry a product and walk sequentially from the start to the end of a U-shaped cell to complete all processes. (3) Division (Subdivided) method, where one cell is divided into zones and multiple workers share a few processes each in a relay.

Key points


  • Cellular production = One or a few multi-skilled workers handle multiple processes end-to-end in a cell (stall), excelling in model changeovers and volume fluctuations.

  • Three cellular forms: (1) One-person stall method (1 worker completes all processes), (2) Circuit/chase method (multiple workers each circulate through all processes), (3) Division method (multiple workers divide processes within a cell).

  • Line production suits low-mix high-volume and allows single-skilled workers to learn quickly, but overall line speed is constrained by the bottleneck process.
WordMeaning
Line production method and Cellular production method (Stall production)
One-person stall method, Circuit (rabbit-chasing) method, Division method
Multi-skilled worker and Morale improvement

Frequent Exam Points and How to Remember Them

In Chapter 1 (Questions 1 to 4), questions first test definitions of corporate activities, the 4 logistics areas (procurement, production, sales, recovery), and primary objectives (QCD) vs secondary objectives (P, S, M, E). Material Handling (Matehan) referring to in-plant transport and loading also appears frequently.

In Question 2, a trap swapping the characteristics of Make-to-Stock and Make-to-Order appears on almost every exam. Contrast and memorize: Make-to-Stock = short delivery lead time, requires demand forecasting and finished goods inventory; Make-to-Order = no finished goods inventory risk, long delivery lead time.

Also, BTO (Build-to-Order)—producing common parts and modules to stock and performing final assembly after order receipt—is the representative method balancing short delivery times and multi-product variety.

In Questions 3 to 4, firmly master the correspondence: High-mix low-volume = Individual production = Job shop (functional layout) & Cellular production; Low-mix high-volume = Continuous production = Flow shop (product layout) & Line production; plus the distinction among the 3 cellular methods (one-person stall, circuit, division).

Key points


  • Make-to-Stock (forecast-based, short lead time, inventory risk) vs Make-to-Order (post-order production, long lead time, no product stock) vs BTO (parts to stock + post-order assembly).

  • High-mix low-volume & individual = General-purpose machines, Job-shop (functional layout) / Low-mix high-volume & continuous = Dedicated machines, Flow-shop (product layout).

  • Cellular production (multi-skilled workers in one-person stall, circuit, or division method) vs Line production (single-model, changeover, or mixed-model line).
WordMeaning
Comparison of Make-to-Stock, Make-to-Order, and BTO
Job-shop type and Flow-shop type
Three Cellular Production methods and Mixed-model line

Production Systems & Types

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Official references

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