Note that the Contract is the basis for a company’s finances, since that is the principle vehicle for money coming into and going out of the company. The financial implications of a Contract are represented by several attributes in the entity classes shown. Indeed, many of the attributes are calculated from others in the model. By convention, these are shown here preceded by the “forward slash” (/).[(]

To begin with, each instance of Activity Specification is expected to have a value for Price Per Hour. Purchasers of each Activity Specification will be charged this rate for the hours required to carry it out. Similarly, each Asset Specification should have a value for Standard Price. The Line Item, then is an order for a specific ...

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