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glossary

BOM (Bill of Materials)

What is a Bill of Materials (BOM)?

A Bill of Materials is the structured, itemized list of every component, part, raw material, and sometimes subassembly needed to build a finished product, along with the quantity of each. It is the recipe a manufacturer works from, and in government contracting it underpins how a deliverable is priced, sourced, and verified.

What a BOM drives

A complete BOM feeds several things at once. It is the basis for cost estimating and pricing, since each line carries a quantity and a cost. It drives procurement and supply-chain planning, telling you what to buy and when. And it supports configuration control, so everyone knows exactly which parts make up an approved build. On complex items the BOM is hierarchical, mirroring how subassemblies roll up into the final product.

Why accuracy matters in federal contracts

In the federal supply chain, BOM accuracy is also a compliance issue. Domestic-sourcing rules, counterfeit-parts prevention, and traceability requirements all depend on knowing exactly what is in your product and where each part came from. An incomplete or sloppy BOM can lead to mispriced bids, supply shortfalls, and audit findings. It often aligns with the lower levels of a work breakdown structure on production programs.

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