Cengage AIS Chapter 4 Quiz Solutions
Q1. Describe all the symbols used in constructing DFDs.
- An external entity symbol portrays a source or a destination of data outside the system
- A bubble symbol depicts an entity or a process within which incoming data flows are transformed into outgoing data flows
- All of these choices are correct
- A data flow symbol represents a pathway for data and a data store symbol represents a place where data are stored
Q2. Why are some entities found in a narrative included in the context diagram as external entities, whereas others are included as internal entities?
- Entities that do not perform any information processing activities are external entities; the remaining entities are internal
- Differentiating entities helps to strike a balance between clarity and clutter
- Entities that do not perform any information processing activities are internal entities; the remaining entities are external
- Differentiating entities helps to avoid crossing lines wherever possible
Q3. What is a context diagram?
- A diagram that explains the context of the process of the company’s internal controls
- A bottom-up diagram that shows all of the details and contextual nuances of a process
- A top-level diagram of a system that depicts the system and all its activities as a single bubble
- A diagram that shows the position of the process within a company’s departments
Q4. What are the differences among a context diagram, a logical DFD, and a physical DFD?
- In a logical DFD (versus a physical or context DFD) we can concentrate on the activities that a system performs.
- All of these choices are correct.
- All of these choices are correct.
- In a logical DFD, (versus a physical or context DFD) bubbles can be broken down into more detail.
Q5. When is a set of DFDs balanced?
- When there are even numbers of processes
- When the data flow bubbles are shown in a parallel formation within the diagram
- When two DFDs have equivalent external data flows, the DFDs are balanced
- When the diagram has more than one level
Q6. What is a physical data flow diagram (DFD)?
- A diagram that tells us how data flows through the process and what activities are performed within the process
- A top-level diagram
- A diagram printed on paper and stored in a user manual
- A diagram that specifies where, how, and by whom a system’s activities are accomplished
Q7. Where are error and exception routines shown on logical DFDs?
- Logical DFDs do not allow for errors and exceptions so they are never needed
- They are shown below the level 0 DFD with reject stubs that indicate that exceptional processing must be performed
- They are only shown in the physical DFD
- They are not shown at all
Q8. What is the purpose of a table of entities and activities?
- The table is used to identify the data elements needed for the process
- The table summarizes the narrative so that entities (nouns) and activities (verbs) found in a narrative are clearly identified
- The table is required prior to creating any documentation
- The table is used to identify internal controls
Q9. Which of the following entities would be considered external to a process in a data flow diagram of a cash receipts process?
- Sales clerk
- Both banks and customers are external entities
Q10. What is the purpose of a systems flowchart?
- The purpose of the systems flowchart is to redesign the system
- The purpose of the systems flowchart is to identify what data elements are needed to process transactions
- The purpose of the systems flowchart is to give the reader a complete picture of a system by combining the physical and logical aspects
- The purpose of the systems flowchart is to torture new accountants
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