Context Diagram (DFD)

Question 1

It shows how data moves through an information system but does not show program logic or processing steps. A set of DFDs provides a logical model that shows what the system does, not how it does it.

Answer 1

Data Flow Diagram (DFD)

Question 2

What are the 4 basic symbols that represent DFDs?

Answer 2

Process, data flows, data stores, and entities

Question 3

What is the name of the symbol of the DFD in the lesson?

Answer 3

Gane and Sarson symbol set

Question 4

It receives input data and produces output that has a different content, form, or both.

Answer 4

Process Symbol

Question 5

It contains the business logic, also
called business rules, which transform the data and produce the required
results.

Answer 5

Process Symbol

Question 6

It is a rectangle with rounded corners.

Answer 6

Process Symbol

Question 7

The name appears inside the rectangle.

Answer 7

Process Symbol

Question 8

It identifies a specific function and consists
of a verb (and an adjective, if necessary) followed by a singular noun.

Answer 8

Process Symbol

Question 9

It is a path for data to move from one part of the information system to another.

Answer 9

Data Flow Symbol

Question 10

It is a line with a single or double
arrowhead.

Answer 10

Data Flow Symbol

Question 11

Name appears above, below, or alongside the
line. It consists of a singular noun and an adjective if needed.

Answer 11

Data Flow Symbol

Question 12

Produces output, but has no input
data flow.

Answer 12

Spontaneous generation.

Question 13

It process that has input, but produces no
output.

Answer 13

Black hole

Question 14

It is a process that has at least one input and one output, but the input obviously is insufficient to generate the output shown.

Answer 14

Gray hole

Question 15

It is used in a DFD to represent data that the system stores because one or more processes need to use the data at a later time.

Answer 15

Data Store Symbol

Question 16

It is a flat rectangle that is open on the right side and closed on the left side.

Answer 16

Data Store Symbol

Question 17

The name appears between the lines and identifies the data it contains.

Answer 17

Data Store Symbol

Question 18

It is a rectangle, which may be
shaded to make it look three-dimensional.

Answer 18

Entity Symbol

Question 19

The name appears inside the symbol.

Answer 19

Entity Symbol

Question 20

It also called terminators because
they are data origins or final destinations.

Answer 20

Entity Symbol