Manufacturing Planning
Translate finished-good demand into build quantities, components, operations, dates and released production orders while accounting for bills of material, yield and capacity.
Each block is planned for 60 minutes: about 35 minutes to learn, 15 minutes for the worked case and 10 minutes for notes or review. Take breaks between blocks. You can complete the lesson over several days.
The idea in simple words
Manufacturing planning answers what to build, how much, from which materials, on which route and by what date. It connects the finished-product plan to dependent component demand and to the resources needed to build it. The example uses a fictional reusable bottle and clearly stated assumptions.
Start here: Constraint planning tells the team which quantities and periods are feasible. Manufacturing planning turns those feasible quantities into a structured, material-aware build plan.
1. Separate the production plan from the detailed schedule
A production plan states what quantity should be built in a period or bucket. A schedule assigns the work to a sequence, resource and time slot. A master production schedule (MPS) often expresses the end item plan; its exact role differs by organization. Manufacturing planning converts the plan into orders and component requirements. Avoid mixing a monthly target with a released shop-floor order: their time detail, status and decision owners differ.
Worked example
The plan calls for 80 bottles in week 2. That is a weekly build target. The factory schedule later places the 80 across machines, shifts and operation times after material and capacity are checked.
Try it · 10 minutes
Write two statements: one production-plan quantity by week and one detailed operation slot. Explain why they are different decisions.
Watch for: A feasible weekly plan is not automatically an executable minute-by-minute schedule.
2. Read the bill of material and explode component needs
A bill of material (BOM) lists the components and quantities needed to make a parent item. For a simple one-level BOM, gross component need equals parent quantity × component quantity per parent. Multi-level BOMs multiply requirements through each level. Check valid dates, alternate components, phantom items, scrap factors and product revisions. Then net component demand against usable stock and scheduled receipts. Keep component units and conversion factors consistent.
Worked example
Each bottle needs one body, one cap and one label. An 80-bottle order creates gross need for 80 bodies, 80 caps and 80 labels. With 10 caps already available and no cap receipts, net cap need is 70 before policy or scrap adjustments.
Try it · 10 minutes
Draw a two-level BOM and explode a 25-unit parent plan. Show gross need for each component and subtract usable stock only afterward.
Watch for: A BOM describes planned relationships; engineering and effective-date controls decide which version is valid.
3. Model routings, work centers and operation time
A routing describes the ordered operations needed to make an item, with resources, run rates and setup times. A work center groups relevant equipment or labor. Operations can have wait, move, queue or inspection time between them. Capacity requirements derive from routing data, but a routing is only as accurate as its standard rates and calendars. Some steps run in parallel; others must be sequential. Identify the critical path for completion rather than adding every duration blindly.
Worked example
Bottle assembly takes 3 minutes per unit on Line A; labeling takes 1 minute on Line B. If both steps are sequential, 80 units require 240 run minutes on A and 80 on B, plus setup and transfer time. The completion time depends on the slower step and handoff, not just total minutes.
Try it · 10 minutes
List three operations for a product, their sequence, resources, setups and rates. Identify which operation controls the earliest completion date.
Watch for: Do not assume every operation can begin at the same time or on any machine.
4. Offset material requirements by lead time
Material requirements planning (MRP) uses the build plan, BOM, inventory records, open orders and lead times to determine when components are needed and when supply should be released. A simple time offset backs component need dates away from the parent due date. Real plans also account for calendars, inspection, order multiples, safety policy and component availability. Late supply can make a planned build impossible even when the finished-good capacity looks adequate.
Worked example
The week-2 build needs caps by Monday of week 2. The cap supplier needs 10 working days and receiving inspection needs 2 more. The purchase release must be scheduled earlier than the build week; ordering when the line is ready would be too late.
Try it · 10 minutes
For a component needed on a chosen date, work backward through supplier, transit and inspection lead times to a planned release date.
Watch for: Use lead times to schedule the arrival of components before the operation that consumes them.
5. Account for yield, scrap, lot size and WIP
Yield is the share of input that becomes acceptable output. If expected yield is 95%, required starts to obtain 80 good units are approximately 80/0.95 = 84.2, so a practical integer plan may require 85 starts, depending on policy. Scrap may occur at a specific operation, so the upstream requirement changes. Lot-size rules, minimum batches, process campaigns and work in process (WIP) affect timing and inventory. Do not apply a yield factor twice if it is already included in the BOM or route.
Worked example
If 100 caps are issued and 2 are rejected, 98 acceptable caps remain. If demand is 80 finished bottles and cap yield is 98%, starts of 80 may not guarantee 80 good caps. Round only after checking the actual unit and process rule.
Try it · 10 minutes
Calculate starts needed for 80 good units at 95% yield. Explain why the result is rounded up and where the loss occurs.
Watch for: Record whether a yield assumption applies to a component, operation or final product.
6. Manage order status, release and change control
Planned orders are suggestions; firmed or released orders carry increasing commitment. The exact status names vary by system. Before releasing an order, confirm material, capacity, revision, quantity, date and approval. Avoid changing a released order without considering supplier and shop-floor impact. Track cancellations, split orders, rework and substitutions. Keep a reason for manual changes and preserve the prior plan for comparison.
Worked example
A planned work order for 80 is firmed after caps are confirmed. Later, the cap receipt drops to 72. A planner should review the impact and approved alternatives; silently leaving the order at 80 can create an impossible release.
Try it · 10 minutes
Create a status path for one order: planned, reviewed, released, started, completed. State which checks occur at each handoff.
Watch for: A status label is meaningful only when everyone knows what commitments it represents.
7. Integrate material, capacity and due-date feasibility
Check the build plan against both components and resources. A component shortage may constrain a product family; a machine overload may constrain a specific operation. Use the same quantity and dates across MRP and capacity calculations. Consider alternate resources, approved components and split lots only when they are valid. Prioritize the most important constraints and show what remains uncovered. Re-run planning after material or capacity changes, while controlling churn inside firm horizons.
Worked example
The plant has enough body components for 100 bottles and enough cap components for 72, while the line can run 76. The build quantity is limited by the smaller feasible supply: 72, unless an approved cap recovery is confirmed.
Try it · 10 minutes
For a 90-unit build, list material availability and capacity for three operations. Find the feasible quantity and show the first binding resource.
Watch for: Having every component in aggregate does not prove that materials and capacity align by date.
8. Review production-plan performance and exception causes
Compare planned starts, released orders, completed good units, scrap, shortages, late orders, downtime and schedule changes. Separate planning error from execution loss: a late component, poor yield, missing labor and wrong forecast require different actions. Use reason codes consistently and review recurring causes. Update standards only with evidence and ownership. A useful manufacturing plan makes exceptions actionable: which order, which material or resource, what quantity, what date and who acts.
Worked example
A plan expected 80 good bottles; 76 passed inspection. The four-unit gap may come from scrap, downtime or a late start. Each cause leads to a different correction; raising next week’s plan by four without diagnosis can create excess or repeat the problem.
Try it · 10 minutes
Complete a short production review with plan, actual good output, variance, coded cause, owner and next action.
Watch for: Do not treat output misses as forecast misses until the cause has been separated.
Further reading and scope
These sources provide background for the planning concepts. The explanations, diagrams and Northstar examples on this page are written for this site. Official software manuals describe the named product and configuration; they do not define a universal process. No source text or figures are reproduced here.
- SAP Help Portal, “MRP Data.” Official vendor documentation; publication date not displayed; accessed 30 October 2026.
Provides a product-specific example of BOM and lead-time-offset data used in MRP. - SAP Help Portal, “Scheduling Control in the Initial Screen.” Official vendor documentation; publication date not displayed; accessed 30 October 2026.
Explains how scheduling settings can determine planned-order dates and capacity requirements in SAP.
Quick knowledge check
Choose an answer before opening the explanation. These questions review the key ideas from all eight blocks.
1. What does a production plan usually state?
- A detailed minute-by-minute sequence only
- What quantity to build in a period
- A customer’s payment status
- A supplier’s legal name
Reveal answer and explanation
Answer: B. What quantity to build in a period The detailed sequence belongs to production scheduling.
2. An 80-unit plan needs 2 caps per unit. What is gross cap need?
- 40
- 80
- 160
- 82
Reveal answer and explanation
Answer: C. 160 80 × 2 = 160 caps before inventory netting.
3. What does a routing describe?
- The order of operations and their resources or times
- A sales promotion
- An inventory valuation rule
- A forecast season
Reveal answer and explanation
Answer: A. The order of operations and their resources or times A routing defines how the product moves through manufacturing steps.
4. If 80 good units are needed at 95% yield, approximate starts are?
- 76
- 80
- 84.2, rounded up per policy
- 95
Reveal answer and explanation
Answer: C. 84.2, rounded up per policy 80 ÷ 0.95 ≈ 84.2; whole-unit planning may require 85 starts.
5. What does MRP help determine?
- When components are needed and when supply should be released
- The product’s brand color
- The annual tax rate
- Only finished-goods price
Reveal answer and explanation
Answer: A. When components are needed and when supply should be released MRP translates build requirements into time-phased component needs and proposals.
6. Why should BOM effective dates be checked?
- Component relationships can change by revision or date
- They change the calendar week
- They set forecast accuracy
- They remove the need for inventory
Reveal answer and explanation
Answer: A. Component relationships can change by revision or date The valid product structure may depend on revision and effective date.
7. What is WIP?
- Work in process
- Warehouse inventory price
- Weekly input plan
- Weighted inventory policy
Reveal answer and explanation
Answer: A. Work in process WIP is product that has started manufacturing but is not yet finished.
8. Why verify materials before releasing a work order?
- To avoid creating a commitment that cannot be built
- To increase seasonality
- To skip inspection
- To eliminate all setup
Reveal answer and explanation
Answer: A. To avoid creating a commitment that cannot be built A release should be executable with available or confirmed materials.
9. A plant has 72 caps, 100 bodies and 76 line slots. What is the current maximum build?
- 72
- 76
- 100
- 248
Reveal answer and explanation
Answer: A. 72 Caps are the first limit, so the feasible build is 72 absent recovery.
10. Why separate scrap from downtime in a production review?
- They have different causes and corrective actions
- They are identical measures
- Scrap changes product names
- Downtime is always forecast demand
Reveal answer and explanation
Answer: A. They have different causes and corrective actions Material yield loss and lost operating time need different interventions.
Educational content only. All quantities, products, scenarios and costs are illustrative. Real methods depend on data quality, local policy, system design, contracts and operating constraints.