Production Control in Japan: Scheduling, Shipping, Who to Ask

You ask a Japanese supplier when your order will ship. The sales contact replies, "We will check with the factory and get back to you." Two days later a date arrives, sometimes with conditions attached. The person who actually worked out that date was most likely in production control, called seisan kanri (生産管理) in Japanese. You rarely meet them, but they decide what gets built, in what order, and when it leaves the plant.

In short, production control turns orders and forecasts into a schedule of what to make, how many, and when, then follows the work until the product ships on the promised date. Of quality, cost, and delivery (QCD), delivery is the one it answers for most directly. If you are a customer chasing a ship date, or a supplier receiving forecasts and purchase orders from a Japanese plant, this is the department whose numbers drive yours.

This guide explains what production control does, where it sits between you and the shop floor, how an order moves from forecast to shipment, and what to ask at each step. It ends with a question list, an email template, and the limits of the guide.

Contents

1. What Production Control (Seisan Kanri) Does
2. Where Production Control Sits Between You and the Plant
3. How Production Type Changes Their Priorities
4. From Forecast to Shipment: Six Steps and What to Ask
5. When Production Control Gives You an Answer
6. Questions to Ask Japanese Production Control
7. Limits of This Guide
8. FAQ
9. Sources

What Production Control (Seisan Kanri) Does

Japan's standard for production management terms, JIS Z 8141, defines production management as managing the production of goods and services. The notes to that definition fill in the scope. It covers forecasting demand, planning production, carrying it out, and controlling it, using people, materials, money, and information. The goal is to produce at the specified quality (Q), cost (C), and quantity and delivery date (D), or to optimize all three.

Put simply, production control organizes everything needed to make the required quantity by the due date at the agreed quality and cost. The "control" part, seisan tosei (生産統制) in JIS terms, means tracking progress so the shop floor can stay on plan. Some companies use "seisan kanri" in this narrower sense: managing work-in-process and schedules on the floor.

Figure 1: Production Control as Defined in JIS

Four activities and four resources, all aimed at QCD.

Goal: produce at the specified Q, C, and DMeet or optimize quality, cost, and quantity and delivery

Activities

Forecasting and planningDecide what to make, when, and how many

ExecutionPrepare materials and issue work orders

ControlTrack progress and correct deviations

Resources

People, materials, money, informationOperators and equipment, materials and inventory, costs, order and stock data

Based on the definition and notes for production management in JIS Z 8141:2022 (Glossary of terms used in production management).

Delivery is production control's direct responsibility, but it cannot chase D alone. Piling on overtime and express freight to hit a date raises cost, and forcing rushed setups can hurt quality. When production control offers you a later date than you wanted, it is often because the earlier date would cost too much in C or Q.

Do not confuse production control with production engineering (seisan gijutsu, 生産技術). Production engineering decides how to make a product: the process, equipment, and methods. Quality assurance checks that it was made correctly. Production control decides when, what, and how many. For a full map of who does what, see Japanese Factory Departments: Who Is Who and Whom to Ask and our guide to seisan gijutsu.

Where Production Control Sits Between You and the Plant

Production control often does not talk to customers or suppliers directly. It typically works through sales on the customer side and through purchasing on the supplier side. Knowing that chain explains why answers take time and why they come with conditions.

Figure 2: How Production Control Links the Departments

Production control connects what each department decides through dates and quantities.

Department

Mainly decides

Link to production control

Sales

Wins orders; agrees dates and quantities with customers

Passes on orders and sales forecasts; receives a delivery date to quote back to the customer

Purchasing

Chooses suppliers; negotiates price and terms; places orders

Receives the quantities and timing of materials and parts needed

Manufacturing

Assigns operators; runs the daily work

Receives work orders; reports output and delays

Production engineering

Designs processes, equipment, and methods

Its standard times and equipment capacity are inputs to the plan

QA / QC

Inspection criteria; defect decisions; corrective action

Defects and rework change the quantities the plan must cover

At some companies, production control also handles purchasing or logistics.

Two points matter for you. First, production control reads quality information as quantity information: if a lot has defects, it has to plan extra production to make up the shortfall. A quality problem at your plant or theirs quickly becomes a schedule problem. Second, organization varies with company size. At smaller firms, one production control person may also place purchase orders and handle shipping. At large manufacturers, separate teams typically handle production planning, materials, shop-floor scheduling, and logistics.

If you are a supplier, the purchase order comes from purchasing, but the quantity and the due date behind it were usually calculated by production control. Price and supplier selection stay with purchasing; see Japanese Procurement: QCD Negotiation and Supplier Ratings and the purchasing process at Japanese manufacturers.

How Production Type Changes Their Priorities

What keeps production control busy depends on how the plant makes things. JIS Z 8141 separates make-to-stock production (mikomi seisan), where products are designed and built ahead of demand for unspecified customers, from make-to-order production (juchu seisan), where the producer builds to specifications the customer sets. Plants also differ in how they batch work: one-off job production, lot production that alternates between products, and continuous production of the same product. Most plants combine these.

Figure 3: What Production Control Focuses On, by Production Type

The way a plant builds shapes what production control watches most closely.

Make-to-stock × continuousExamples: beverages, household goods, general-purpose parts. Forecast accuracy and inventory levels decide success: avoid both overproduction and stockouts.

Make-to-stock × lotExamples: home appliances, standard machine parts. The key is balancing the number of changeovers against lot size.

Make-to-order × lotExamples: auto parts mass-produced to the customer's specs. Most of the work is bridging the gap between the customer's forecast (naiji) and firm orders.

Make-to-order × jobExamples: industrial machinery, special equipment, molds and dies. Design progress and long-lead parts decide the delivery date.

Terms as defined in JIS Z 8141:2022. Examples are typical; plants in the same industry can differ.

For make-to-stock plants, production control carries the inventory risk when a forecast misses. Unsold stock costs storage and write-offs, and stockouts cost sales, so inventory numbers get checked almost daily. For make-to-order job shops, inventory risk is small, but production control may have to order long-lead parts before the design is final. As a customer of a job shop, expect questions about design freeze dates, because they drive when those parts can be ordered.

A changeover (dandori gae, 段取替え) means preparing materials, jigs and tools, and drawings, plus trial runs, when switching to another product or operation. In lot production, the number of changeovers has a large effect on efficiency. A small urgent order that forces an extra changeover is harder to fit in than its quantity suggests. For more on changeovers, see SMED Step by Step.

From Forecast to Shipment: Six Steps and What to Ask

Production control work falls into two phases: making the plan and executing it. The figure shows a straight line, but in practice the loop of plan, execute, detect deviations, and replan runs every day and every week.

Figure 4: The Production Control Workflow

Six steps in two phases: planning and execution.

Plan

01Forecasts and ordersCollect sales forecasts and firm orders to see how much must be made

02Production planSet quantities and timing at long-, mid-, and short-range levels

03Requirements and orderingCalculate materials from the BOM and stock; order from purchasing and internal processes

Execute

04Work ordersTell the floor which line makes what, and when

05Progress, capacity, physical stockFind delays and capacity gaps; resequence work and reassign people

06ShipmentConfirm finished quantities and coordinate with logistics to ship

Step 05 is "production control" in the narrow JIS sense (seisan tosei). The results of 05 typically feed back into steps 02 and 03 every week.

1. Forecasts and Firm Orders

Everything starts with how much needs to be made. Make-to-stock plants forecast demand from past shipments and sales plans. Make-to-order plants use firm orders plus naiji (内示), the customer's advance notice of expected quantities for the coming months. Good production control staff do not take these numbers at face value; they learn how much a customer's naiji tends to shift before it becomes a firm order, and whether sales forecasts run optimistic.

That works in both directions. If you are a customer, the accuracy of the forecast you give a Japanese supplier shapes how much buffer they build into their answers. If you are a supplier receiving naiji from a Japanese customer, treat it as a planning signal, not a commitment, and agree in writing which part of it they will pay for if it changes. For how naiji works alongside kanban deliveries, see Supplier Kanban for Japanese Customers: MRP vs. Kanban.

2. The Production Plan: Long, Mid, and Short Range

JIS defines a production plan as a plan for production quantity and timing, and notes that it may be split into long-range (dai-nittei, 大日程), mid-range (chu-nittei, 中日程), and short-range (sho-nittei, 小日程) schedules. The shorter the horizon, the finer the detail.

Figure 5: Long-, Mid-, and Short-Range Schedules

The long plan sets the frame; the shorter plans fill in the detail.

Long range (dai-nittei)1 to several years: directionSets overall capacity from the sales plan: equipment investment, staffing, use of subcontractors

Mid range (chu-nittei)Months to 1 year: quantity and timingMaster production schedule (when and how much of each product), material procurement plan, labor-hour and staffing plan

Short range (sho-nittei)Day and week: detailed schedulingAssigns which machine, which operator, what job, and what start time; issues work orders and material issue orders

Period boundaries vary by company and source. The relationship is what matters: the long range sets the capacity frame, the mid range sets quantities, and the short range turns them into each day's work on the floor.

For you, the useful question is which horizon your request falls into. A change inside the short-range schedule means reshuffling machines and people that are already assigned. A change in the mid-range plan may only mean adjusting material orders. Ask your contact when the plan for your delivery week is fixed and how often it is revised.

3. Material Requirements and Ordering

Once the plan is set, production control works out which materials and parts are needed. It compares the bill of materials (BOM), current stock, and quantities already on order, then orders only the shortfall. This logic is material requirements planning (MRP), built into most production management systems. Bought-out items go to purchasing as requests; parts made in-house go to the internal parts processes as production instructions. JIS calls this step buhin tehai (部品手配), parts ordering.

Here is a worked example with fictional numbers. It also shows a supplier why a Japanese customer's order quantity and timing look the way they do.

Figure 6: Requirements Calculation Example (Part B)

From the plan for Product A, work out when to order Part B and how many.

Item

Qty

Logic

Production plan, Product A

100

Units planned for the week three weeks from now

Gross requirement, Part B

200

BOM: 2 units of Part B per Product A → 100 × 2

On-hand stock

−50

Available (unallocated) stock in the warehouse

Scheduled receipts

−30

Already ordered and due to arrive

Net requirement

120

Actual shortfall → 200 − 50 − 30

Order quantity

150

Rounded up to the supplier's order multiple of 50

Order timing

This week

Part B lead time is 2 weeks, counted back from the week of use

Fictional numbers for illustration. Real plans may also add safety stock or an allowance for defects.

The calculation needs four inputs: the BOM (what and how many), inventory (how many on hand now), lead time (from order to receipt, or from start to completion), and capacity (how many can be made per day). For products with hundreds or thousands of parts, a production management system runs the MRP calculation and allocates stock, while staff check whether the results make sense. Because the output is only as good as the BOM and stock records, keeping that master data accurate is part of production control's job.

Two things follow for suppliers. The lead time you quote is built into the customer's system, so if your real lead time grows, tell them early; otherwise their MRP will keep ordering too late. And your order multiple and minimum quantity change how much they order. Production control's job is to give purchasing the right quantity at the right time. If that is wrong, no amount of good negotiation gets the part there on the day it is needed.

Against MRP's push planning, a pull system has the downstream process withdraw from the upstream process only what it has used. Kanban in the Toyota Production System is the best-known example, and many mass-production plants use both. The supplier kanban guide covers how the two fit together.

4. Work Orders and Sequencing

From the short-range schedule, production control issues work orders to the floor: part number, quantity, machine, and planned start and finish times. When several jobs compete for the same machine, deciding the order is called sashitate (差立て), dispatching. The sequence changes both the number of changeovers and whether a rush order makes it, so most plants set it together with shop-floor leaders. A request to move your job forward is really a request to change this sequence.

5. Progress, Capacity, and Physical Stock

Once work starts, production control tracks whether it is on plan. JIS lists three related activities under production control in the narrow sense:

• Progress control (shinchoku kanri, 進捗管理): track how work is advancing and adjust daily for delays or work running ahead.
• Capacity control (yoryoku kanri, 余力管理): compare load against capacity for each process and operator, and reallocate work to balance load against capacity.
• Physical stock control (genpin kanri, 現品管理): know where materials, work in process, and finished goods are, and how much is sitting idle.

Physical stock control is the one most often missed. The system shows stock, but the shelf is empty, or work in process sits between processes for days. That is why a Japanese contact may answer "the system says it is available, but we will confirm the actual stock" before committing to a date. Regularly reconciling system records with physical stock keeps the plan accurate.

More plants now collect equipment status and work results automatically from the floor, so deviations from plan show up in near real time; this shifts production control from compiling data toward making decisions. Equipment breakdowns hit this step hardest. Production control works closely with maintenance (hozen); see Hozen in Japanese Plants.

6. Shipment and Japan's Trucking Squeeze

Finished goods ship only after they pass inspection. Production control shares the final checks with logistics and the warehouse: ship date and quantity, packing and shipping documents, and truck arrangements.

Shipping from Japanese plants has become harder to rush. Since April 2024, truck drivers in Japan have been subject to an annual overtime cap of 960 hours, a change known in Japan as the "2024 problem." A government study group estimated that, without countermeasures, commercial trucking capacity could fall 34.1% short in 2030. Under the revised Logistics Efficiency Act, all shippers have had a duty since April 2025 to make efforts to cut truck waiting and loading times, and from April 2026 designated shippers handling 90,000 metric tons or more of cargo a year must appoint a chief logistics officer, among other duties. Shippers are also being asked to use truck booking systems to cut waiting time. The practical result: "ship the same day it is finished" is less reliable than before, so planning backward from the ship date matters more. Ask whether your ship date assumes a truck booking or only a finish date.

When Production Control Gives You an Answer

Most of production control's day goes to closing the gap between plan and reality, not to planning. The timeline below is a typical example for someone handling mass-produced items. It also shows when a delivery inquiry is likely to be handled.

Figure 7: A Typical Day in Production Control (Example)

Mornings go to reviewing results, midday to adjustments, evenings to preparing the next day.

8:00Review yesterday's resultsCheck output, defects, and equipment stops; list deviations from plan

8:30Morning meeting on the floorAgree on the day's priorities, staffing, and shortage risks with production leaders

10:00Check incoming parts and expediteConfirm late parts with purchasing; identify which products are affected

13:00Answer delivery inquiries from salesFor rush orders or pull-in requests, check capacity and parts, then give a delivery date

15:00Rework the scheduleReflect delays and added orders in the sequence from tomorrow on; notify related departments

17:00Confirm shipments; release tomorrow's work ordersMake sure nothing missed today's shipment, and finalize the next day's work orders

One example only. Time use varies widely by industry, production type, and job scope.

Two practical points. A request that reaches production control after the next day's work orders are released usually waits for the following schedule revision. And with time zones between Japan and the US, India, or Southeast Asia, a question sent in your afternoon may land after that cutoff. Sending clear, complete requests early in Japan's working day shortens the loop.

Why the Answer Comes With Conditions

Production control sits between departments that want different things. Sales wants to ship early for the customer. Manufacturing wants fewer changeovers. Purchasing wants to bundle orders to buy cheaper. Production control looks for the best overall compromise and must be able to justify it with numbers. That is why answers often read like "possible if we receive the drawing by X" or "partial shipment of N units on date Y."

Equipment breakdowns, late parts, defects, and customer quantity changes disrupt plans almost daily; a plan that runs to the end unchanged is the exception. A capable production control team can quickly state which product, which shipment, and how many days are affected. With that, the plant can decide early whether to recover with overtime or to discuss a new date with you. Ask for exactly that impact statement when something goes wrong.

Production control's results show up directly in numbers such as on-time delivery rate, inventory value or days on hand, and production lead time. Cutting inventory to the right level eases cash flow, and shorter lead times help win orders. With those numbers in mind, it is easier to see why a supplier resists building ahead (inventory) or splitting lots (changeovers).

Questions to Ask Japanese Production Control

Your questions will usually go through sales (if you are the customer) or purchasing (if you are the supplier). Phrasing them in production control's terms gets faster, more precise answers.

If You Are the Customer

• Is the delivery date you gave me an ex-works date, a ship date, or an arrival date? Does it include a booked truck or vessel?
• Which parts or materials limit this date? Are any of them long-lead items?
• Until what date can I change quantity or delivery without extra cost? When is the schedule for my delivery week fixed?
• How do you use the forecast I send? Which part of it do you treat as committed?
• If I need a pull-in, what would it take: overtime, an extra changeover, or a partial shipment?
• If a delay occurs, can you tell me which order, how many units, and how many days are affected, and the recovery plan?
• (Make-to-order equipment) By when do you need the final drawings or specifications to keep this date?

If You Are the Supplier

• How far ahead does your naiji (forecast) run, how often is it updated, and which portion becomes a firm order?
• If the forecast drops, which portion of materials or work in process will you cover?
• What lead time and order multiple are registered for my parts in your system?
• Who sets the quantities and due dates on your purchase orders, and who should I contact if a date cannot be met?
• Do you want early warning of risks (capacity, materials) before they become a delay? In what format?
• Which delivery window and truck arrangement do you expect at your dock?

Email Template: Requesting a Delivery Date Answer

Adapt this to your situation. It gives production control everything needed to answer in one pass.

Subject: Delivery date request – [Part number], PO [number]

Dear [Name],

Could you please ask your production control team to confirm the delivery date for the following order?

- Part number / revision: [ ]
- Quantity: [ ] (partial shipment acceptable: yes / no)
- Requested date: [ ] (arrival at [location])
- Incoterms / shipping method: [ ]
- Forecast for the next 3 months: [ ] (for planning only, not a firm order)

If the requested date is not possible, please tell us:
1. The earliest possible date and quantity
2. What limits the date (materials, capacity, drawings, inspection)
3. Anything we can do to make an earlier date possible

We would appreciate your answer by [date].

Best regards,
[Name]

Limits of This Guide

• Scope and job titles differ by company. At some firms production control includes purchasing or logistics; at others it covers only shop-floor scheduling.
• Planning horizons (long, mid, short range) and the point where a schedule is fixed vary by company and industry. Confirm them with your counterpart.
• The calculation example and daily timeline are fictional illustrations, not data from any company.
• Japanese logistics rules are summarized for background only. Contract terms, Incoterms, and the shipper's legal duties should be checked with the parties involved.
• Japanese plants outside Japan may run production control in a different way, depending on the local organization and systems.

FAQ

What Does Seisan Kanri Mean?

Seisan kanri (生産管理) means production control or production management. In a Japanese plant, it usually refers to the department that plans what to make, how many, and when, orders materials, and tracks progress until shipment.

What Is the Difference Between Production Control and Production Engineering?

Production engineering (seisan gijutsu) decides how to make a product: processes, equipment, and methods. Production control (seisan kanri) decides when, what, and how many to make, and keeps the schedule on track.

Who Decides the Delivery Date at a Japanese Supplier?

Sales communicates it, but production control usually calculates it from capacity, materials, and the current schedule. For complex or urgent requests, ask sales to check directly with production control.

Is a Naiji Forecast a Purchase Order?

No. Naiji (内示) is an advance notice of expected quantities used for planning. The firm order comes later. Who pays for materials if the forecast changes depends on the agreement between the companies, so confirm it in writing.

Sources

• Definitions of production management, make-to-stock and make-to-order production, production planning, production control, and changeover: JIS Z 8141:2022 (Japanese Standards Association; term text via jis.eomec.com, Japanese)
• Long-, mid-, and short-range production plans: Asprova, production planning guide (Japanese)
• MRP: Hitachi Solutions East Japan, "What Is MRP?" (Japanese)
• Truck driver overtime cap and 2030 capacity estimate: Japan Trucking Association, "The 2024 Logistics Problem" (Japanese); World Economic Forum, Japan logistics (2024)
• Revised Logistics Efficiency Act, shipper duties and chief logistics officer: Japanese Law Translation, outline of the amending act; Japan Institute of Logistics Systems (Japanese); Nomura Research Institute column on the 90,000-ton threshold (Japanese)