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What type of BOM is created?

As explained above, there are different types of BOMs according to the use of business applications, however, in the manufacturing industry, there are two main types of BOMs, called “Engineering BOM (E-BOM)” and “Manufacturing BOM (M-BOM)”. Engineering BOM (E-BOM) is mainly used for product designing, whereas Manufacturing BOM (M-BOM) is used for product manufacturing.

Engineering BOM (E-BOM)

Engineering BOM (E-BOM)

E-BOM consists of a structure and quantity of raw materials required for manufacturing a product. There are two types of structure; flat style and layer style. Product designer creates E-BOM with the specifications and functionalities based on the customer or market requirements. Usually, E-BOM does not include the information for manufacturing such as manufacturing process or method etc.

E-BOM contains the following information
- Item name (i.e. Panel, Unit, Circuit board, screw, etc.)
- Quantity (i.e. required number of part, unit number of purchasing, etc.)
- Specification (i.e. Industrial standard, Specification number, etc.)
- Type (i.e. model, parts type, series, etc.)
- Manufacturer (i.e. maker, supplier, etc.)
- Technical information (i.e. Drawings (2D/3D), etc.)

Manufacturing BOM (M-BOM)

Manufacturing BOM (M-BOM)

Information in M-BOM is structured and defined by the product unit or circuit board for counting the number of required parts for manufacturing. Manufacturing is basically executed according to the E-BOM which is created in design department. However, M-BOM is created by adding an additional information for manufacturing such as parts, materials, processes or method in production engineering department because E-BOM does not have such type of information. M-BOM is also used for production scheduling, purchasing, process control and order of production in MRP (Material requirement planning) and MES (Manufacturing execution system).

M-BOM contains the following information
- Process (i.e. tools, facility, etc.)
- Parts/materials

In addition, these BOMs can be converted and reused in other business processes such as sales estimation, purchasing and maintenance as well. For example, purchasing BOM is for purchasing materials or parts. It usually contains the required information for purchasing such as a unit number of order, price by supplier or multi-supplier goods. Also, service BOM is for product maintenance or support. It contains the information related to parts or materials for maintenance or service work.