Figure 17-3 shows that the entity classes we’ve just been describing are special cases of the Assets, Activities, Activity Types, Asset Specification Structures, and Facilitiesdescribed in the enterprise model in Section Two.

Since a Sample is a physical material, it is a sub-type of Asset, as are the Inventory or Lot that it may be drawn from. It may also be extracted from the Asset that is a Piece of Equipment, such as a pump or other part of the manufacturing machinery. Or, without identifying the Piece of Equipment, it can be simply taken from a particular Work Center (or Storage Location)—that is, a Facility. In something other than the manufacturing context, it could be taken from an Other Facility, such as an air ...

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