Chap004 - Chapter 4, The REA Enterprise Ontology: Business...

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Unformatted text preview: Chapter 4, The REA Enterprise Ontology: Business Process Modeling True/False Questions 1. The REA pattern can only be portrayed using entity-relationship modeling notation. Ans: False Response: The REA pattern is independent of any particular modeling notation. 2. Conceptual modeling constructs include entities, relationships, attributes, and participation cardinalities. Ans: True 3. Driver's license number would serve as a good primary key for the entity set Student . Ans: False Response: It would likely not be universal. 4. A simple attribute is an attribute that cannot be further decomposed. Ans: True 5. The value of a volatile derivable attribute will not change if additional transaction data are entered into the database. Ans: False Response: The value of a static derivable attribute will not change; the derived value will change for volatile derivable attributes. 6. Typification is an abstraction relationship used to relate an entity set (A) in which the members are instances to an entity set (B) in which the members are categories into which the instances of set (A) belong. For example, typification relates the entity set Employee to the entity set Employee Category . Ans: True 7. A minimum participation cardinality of zero for an entity set in a relationship indicates that an instance of that entity set cannot exist without a related instance of the related entity set. Ans: False Response: It indicates that the entitys participation in the relationship is optional, and thus it can exist without a related instance of the related entity set. 40 Dunn/Cherrington/Hollander, Enterprise Information Systems: A Pattern Based Approach, 3e Chapter 4, The REA Enterprise Ontology: Business Process Modeling 8. The REA core pattern completely describes the business processes of most enterprises. Ans: False Response: Extensions to the pattern have already been identified and additional extensions are likely to be discovered in years to come. 9. To take advantage of script pattern thinking we need to sift away the details that make scripts different from each other and discover conceptual commonalities. Ans: True 10. Claims in the REA ontology are timing differences between economic increment and economic decrement events. Ans: True 11. Preparation of a value chain level REA model accomplishes the first four steps of business process level REA modeling. Ans: False Response: Preparation of a value chain level model accomplishes the first step and helps with the second but does not do anything for steps 3 and 4. 12. Assignment of attributes to entities in a business process level REA effectively communicates enterprise business rules. Ans: False Response: Business rules are communicated via participation cardinalities, not attributes....
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Chap004 - Chapter 4, The REA Enterprise Ontology: Business...

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