A bill of material defines the expected relationship between an output and its components. Production planning uses that structure with demand, available stock and operational capacity to decide what can be made and when.
Make the product structure explicit
List each component, quantity and unit needed for the planned output. Include approved substitutes, expected scrap or by-products only when the process requires them and the team can maintain the information reliably.
Control revisions so a work order keeps the structure that was valid when it was released.
Check materials before releasing work
Compare required quantities with usable stock, existing reservations and incoming purchases. A shortage should create a visible decision: buy, substitute, reschedule or reduce the run.
- Define the warehouse from which materials will be issued.
- Sequence operations and responsible workstations.
- Keep subcontracted steps connected to their purchase records.
Record actual output and variance
Capture actual material consumption, completed quantity, rejected quantity and supported quality results. The difference from the plan is operational information, not merely an accounting adjustment.
Review recurring variance before changing the bill of material. The cause may be a process problem, unit error, supplier-quality issue or an outdated standard.