eBOM
The engineering Bill of Materials (eBOM) is the structured list of every part, subassembly, and raw material needed to design and define a product. It is authored and maintained by engineering in PLM, reflects the functional and design intent, and is structured around how the product is designed (functional hierarchy) rather than how it is built. The eBOM is the authoritative source for downstream manufacturing, procurement, and service BOMs.
Why it matters
The eBOM is PLM's most critical output. Every downstream system — ERP (mBOM), MES (work orders), service (sBOM), and procurement — derives its BOM from the eBOM. Governance of the eBOM (change control, version management, configuration effectivity) is the core value proposition of PLM, and the reason informal BOM management in spreadsheets eventually fails as product complexity grows.
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Cite this definition
Finocchiaro, Michael. “eBOM.” DemystifyingPLM PLM Glossary, 2026, https://www.demystifyingplm.com/glossary/ebom