Rule Definition

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In the rule definition subphase the business rules are added, giving the system its real meaning. Business rules are defined for the business objects, and translated into constraints.

The main focus in the rule definition sub-phase is on the business events that the system should support. Three types of business rule are defined:

· Instructions as to how the user should handle the business events and tasks that are defined within the business object. For example, what to do if a new customer calls, or if a customer cancels an order.


· Restrictive rules that translate into constraints to shield the data from incorrect handling. For example, an order cannot be canceled after delivery.


· Behavioral rules that automatically change information in reaction to certain situations. These rules are translated into corrective constraints.