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As business becomes more responsive to unique consumer tastes and derivative products grow to meet the unique configurations, BOM management can become unmanageable. For manufacturers, a bill of materials (BOM) is a critical product information record that lists the raw materials, assemblies, components, parts and the quantities of each needed to manufacture a product.
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[[Image:Product structure modeling meta-data model1.gif|right|thumb|300px|Figure 1: product structure concepts]]Figure 1 illustrates the concepts that are important to the structure of a [[Product (business)|product]]. This is a [[Meta-modeling technique|meta-data model]], which can be used for modeling the instances in a specific case of product structuring.
The core of the product structure is illustrated by the product components (''[[wikt:item|item]]s'') and their ''relationships''. Thus, this involves the linking between items related to the [[Product (business)|product]].
The ''[[manufacturing|assembly]]'' can consist of ''subassemblies'' and ''parts'', whereas ''subassemblies'' can also consist of other subassemblies or part. Thus, this is typically hierarchically ordered. These concepts are generalized into the concept of item. This classification is overlapping, because a subassembly could be a part in another assembly configuration.
Due to differentiation and variation of items several concepts must be indicated into the product breakdown structure. Three concepts are involved in this differentiation, namely ''alternatives'', variants and ''revisions''. An alternative of an item is considered as a substitute for that particular item, whereas a variant is another option of an item which the consumer can choose. When an error occurs at a part or subassembly, it needs to be revised. This revision indicates the change history of the item.
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