Podcast
Questions and Answers
What is the primary purpose of a context level data flow diagram?
What is the primary purpose of a context level data flow diagram?
Which symbol is commonly used to represent an external entity in a data flow diagram?
Which symbol is commonly used to represent an external entity in a data flow diagram?
In an entity-relationship diagram, what does the crow's foot notation indicate?
In an entity-relationship diagram, what does the crow's foot notation indicate?
What is the term used to describe the elements that make up an organizational system?
What is the term used to describe the elements that make up an organizational system?
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In an entity-relationship diagram, what is an associative entity?
In an entity-relationship diagram, what is an associative entity?
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Which concept is most closely associated with system control in an organizational system?
Which concept is most closely associated with system control in an organizational system?
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In a scenario where each employee in an organization has a unique phone extension and a unique cubicle, what type of relationship exists between employees and cubicles?
In a scenario where each employee in an organization has a unique phone extension and a unique cubicle, what type of relationship exists between employees and cubicles?
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Which symbol is NOT used in a context level data flow diagram?
Which symbol is NOT used in a context level data flow diagram?
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What is the purpose of an attributive entity in an entity-relationship diagram?
What is the purpose of an attributive entity in an entity-relationship diagram?
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Which of the following is NOT a valid external entity in a data flow diagram?
Which of the following is NOT a valid external entity in a data flow diagram?
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Study Notes
System Control and Organizational Systems
- Feedback is most closely associated with system control.
- The elements that make up an organizational system are called entities.
Context Level Data Flow Diagram
- The context level data flow diagram depicts the boundaries of a system.
- The symbols used on the context level data flow diagram are rectangle with rounded corners, arrow, and shaded corner square, but not triangle.
External Entities and Relationships
- An external entity can be a person, another department, another computer system, or all of the above.
- In an entity relationship diagram, a crow's foot line is used to depict a relationship.
Entity Relationships
- A 1:1 relationship exists when each instance of one entity is related to only one instance of another entity, such as an employee having a unique phone extension.
- A crow's foot notation indicates that one entity is related to many instances of another entity.
Entity Types
- An attributive entity describes attributes, such as repeating groups.
- Other types of entities include fundamental entities, associative entities, and external entities.
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Description
Test your knowledge on system control and data flow diagrams with this multiple-choice quiz. Questions cover topics such as elements of organizational systems, symbols used in context level data flow diagrams, and more.
