What is BOM?

Bill of materials (BOM) is the term used to describe the raw materials, sub-assemblies, intermediate assemblies, sub-components, components, parts and the quantities of each needed to manufacture a final product.[1] It may be used for communication between manufacturing partners,[2] or confined to a single manufacturing plant.

A BOM can define products as they are designed (engineering bill of materials), as they are ordered (sales bill of materials), as they are built (manufacturing bill of materials), or as they are maintained (service bill of materials). The different types of BOMs depend on the business need and use for which they are intended. In process industries, the BOM is also known as the formula, recipe, or ingredients list. In electronics, the BOM represents the list of components used on the printed wiring board or printed circuit board. Once the design of the circuit is completed, the BOM list is passed on to the PCB layout engineer as well as component engineer who will procure the components required for the design.

BOMs are hierarchical in nature with the top level representing the finished product which may be a sub-assembly or a completed item. BOMs that describe the sub-assemblies are referred to as modular BOMs. An example of this is the NAAMS BOM that is used in the automative industry to list all the components in an assembly line. The structure of the NAAMS BOM is System, Line, Tool, Unit and Detail.

The first hierarchical databases were developed for automating bills of materials for manufacturing organizations in the early 1960s.[3]

A bill of materials "implosion" links component pieces to a major assembly, while a bill of materials "explosion" breaks apart each assembly or sub-assembly into its component parts.

A BOM can be displayed in the following formats:

• A single-level BOM that displays the assembly or sub-assembly with only one level of children. Thus it displays the components directly needed to make the assembly or sub-assembly.[4][5]

• An indented BOM that displays the highest-level item closest to the left margin and the components used in that item indented more to the right.[1]

• Modular (planning) BOM A BOM can also be visually represented by a product structure tree, although they are rarely used in the workplace.[1]
  

See also

• Bill of quantities (BOQ)
• Bill of resources (BOR)
• Configurable BOM (CBOM)
• Enterprise resource planning (ERP)
• Manufacturing resource planning (MRP II)
• Material Requirements Planning (MRP)
• Product data management (PDM)

References

1. ^a b c Reid, R. Dan; Sanders, Nada R. (2002). Operations Management. John Wiley & Sons, 457-458. ISBN 0-471-32011-0.
2. ^"In Search of the Perfect Bill of Materials (BoM)" (PDF). National Electromnics Manufacturing Inititative Inc. (March 2002). Retrieved on 2008-09-28. "As the primary conduit for data transfer among manufacturing partners, the BoM is central to the product life cycle from the very beginning."
3. ^ "Bill of Materials". The Free Dictionary. Retrieved on 2008-09-28.
4. ^ "Single Vs. Multi-Level BOMs". Popular Q&A, Oracle Knowledge Base. Oracle (2003-07-30). Retrieved on 2008-10-26.
5. ^ "Bill of Materials". Inventory Interface. Retrieved on 2008-10-26.