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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.
Advanced modeling techniques are necessary to cope with configurable products where changing a small part of a product can have multiple impacts on other product structure models. Concepts within this entry are
Several concepts are related to the subject of product structure modeling. All these concepts are discussed in this section. These concepts are divided into two main aspects. First the product breakdown is discussed which involves all the physical aspects of a [[Product (business)|product]]. Second, different views at the product structure are indicated.
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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 ''
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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Product structure views are made upon several activity domains within the company. Due to the fact not everyone in the company has to have a detailed overview of the product several components with their attributes can be extracted.
When the
==The modeling process==
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===Create master structure===
After structuring the product with all the listed items and relationship between them this must be combined into one MASTER STRUCTURE which contains all of the details of the product. In case of the car, all items from engine to screw must be documented in one MASTER STRUCTURE.
[[Image:Product structure modeling example master structure.gif|centre|Figure 6: product master structure]]
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[[Category:Computer-aided design]]
[[Category:Product lifecycle management]]
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