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Often, BOMs contain hierarchical information with the master, or top level, BOM describing a list of components and sub-assemblies. Take a , Motherboard , case, etc.

This increasing level of detail continues for all sub-assemblies until it reaches its constituent parts (like resistors or processors), or modules that are out of the scope of the BOM (like the parts that make up a fan that is bought in as a module from another manufacturer).

BOMs are important, since without a basic knowledge of how many parts a product needs, there is no way of knowing how many units of that part you need to buy.

A bill of material can define products as they are designed, as they are manufactured, as they are ordered, as they are built, or as they are maintained. There are different types of bills of materials dependent upon the discipline that generates them and the purpose for which they are intended. It is important to ensure the type of bill of material that you have and its intended use prior to working with a bill of material.

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