eBOM (Engineering BOM)
The Engineering Bill of Materials (eBOM) is the structured list of parts, subassemblies, and materials that defines what a product is, organized the way engineering thinks — by function, design intent, and as-designed hierarchy. The eBOM is owned by engineering and lives in PLM. It is the upstream system of record for the product structure: every other BOM view downstream — manufacturing, service, sales — is derived from it through a documented translation step.
Why it matters
The eBOM is the anchor for engineering change governance. An ECO that modifies the eBOM is the trigger that, in a working PLM-to-ERP-to-MES architecture, propagates cleanly through process planning, procurement, and shop-floor routings. If the eBOM is not the upstream system of record, every downstream system is operating on a stale or invented copy.
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External References
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Cite this definition
Finocchiaro, Michael. “eBOM (Engineering BOM).” DemystifyingPLM PLM Glossary, 2026, https://www.demystifyingplm.com/glossary/ebom-engineering-bom