Data flow diagrams

Question 1

What are data flow diagrams?

Answer 1

Show how data is inputted and moves through a system till its output

Question 2

What is the purpose of the rectangle symbol in data flow diagrams?

Answer 2

External Entity

Question 3

What is an an external entity in data flow diagrams?

Answer 3

Inputs or outputs of data

Question 4

What is the purpose of the rounded edges rectangle symbol in data flow diagrams?

Answer 4

Process

Question 5

What is the process in data flow diagrams?

Answer 5

Where data is manipulated

Question 6

What is the purpose of the arrow symbol in data flow diagrams?

Answer 6

Data flow

Question 7

What is the data flow in data flow diagrams?

Answer 7

Shows the way data is moving

Question 8

What is the purpose of the square shape with legs on its side in data flow diagrams?

Answer 8

Data store

Question 9

What is a data store in data flow diagrams?

Answer 9

Any real world store of data

Question 10

What rule relates to the connections of every data entity in data flow diagrams?

Answer 10

Every data entity needs at least 1 input to be connected to the system.

Question 11

What rule relates to the flow of data in data flow diagrams?

Answer 11

Data flows in one direction

Question 12

What rule relates to the labelling of data flows in data flow diagrams?

Answer 12

A comment should be attached to the arrows identifying what data is being transmitted.

Question 13

What rule relates to the input and output of data in data flow diagrams?

Answer 13

Must be at least one input and one output for each process.