10 Questions
What is the primary purpose of a context level data flow diagram?
To depict the boundaries and external entities of a system
Which symbol is commonly used to represent an external entity in a data flow diagram?
Rectangle with rounded corners
In an entity-relationship diagram, what does the crow's foot notation indicate?
A many-to-many relationship between entities
What is the term used to describe the elements that make up an organizational system?
Entities
In an entity-relationship diagram, what is an associative entity?
An entity that represents a relationship between two or more entities
Which concept is most closely associated with system control in an organizational system?
Feedback
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?
One-to-one
Which symbol is NOT used in a context level data flow diagram?
Triangle
What is the purpose of an attributive entity in an entity-relationship diagram?
To describe attributes or characteristics of another entity
Which of the following is NOT a valid external entity in a data flow diagram?
A process within the system
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.
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.
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