Deck 7: Using Data Flow Diagrams

Question 1

Transaction files:

A)are used when interface data flow exist on data flow diagrams.
B)may be used to link processes that execute at different times.
C)are included to store all derived elements.
D)are required to implement all on-line processes.

Answer 1

B

Question 2

Physical data flow diagrams:

A)include processes for adding, updating, changing and deleting records.
B)are used to model business events, along with their input and output.
C)enable the analyst to better understand the business.
D)include no interface data flow in or out of processes.

Answer 2

A

Question 3

Which of the following is not an advantage of using a physical model?

A)Transaction data stores are identified.
B)It is easier to create compared with the logical model.
C)The sequence of processes is identified.
D)Controls are included.

Answer 3

B

Question 4

A CRUD matrix is used to show:

A)places in the system where the data is inaccurate.
B)where records are updated, added, deleted or used.
C)which Web pages are placed on a secure server.
D)the partitioning of data flow diagrams in a client/server environment.

Question 5

What is the middle of the process symbol used for?

A)process sequence
B)identifying number
C)process description
D)process implementation

Question 6

A primitive process is:

A)a process that is not exploded to a child diagram.
B)the central process on a context level diagram.
C)a process that requires two or more data flow into it.
D)a process that has only base elements flowing in or out of it.

Question 7

A logical data flow diagram:

A)includes types of programs, such as online or batch.
B)is a model of how the system will be implemented.
C)does not include any primitive processes.
D)is a model of how the business operates.

Question 8

A use case:

A)summarizes an activity, its trigger, input, and output.
B)describes a subsystem of a data flow diagram showing how the processes use data produced by other processes.
C)describes how the data is partitioned into programs for different users.
D)shows when the data is updated, read, created or deleted.

Question 9

When the data flow in and out of a parent process do not match the data flow in or out of a child diagram, it is called:

A)a primitive process.
B)a disordered pair.
C)a logical data flow diagram.
D)unbalanced decomposition.

Question 10

Partitioning on a data flow diagram for an ecommerce Web site may be used to show:

A)external events.
B)triggers.
C)security.
D)derived elements.

Question 11

Which is not one of the four basic symbols used to chart data movement on data flow diagrams?

A)an oval
B)arrow
C)rectangle with rounded corners
D)open-ended rectangle

Question 12

In a CRUD matrix, each row represents the data stores used for each:

A)process.
B)database table.
C)data flow child diagram.
D)activity.

Question 13

Which is the biggest advantage of the data flow approach over narrative explanations?

A)freedom from committing to the technical implementation of the system too early
B)further understanding of the interrelatedness of systems and subsystems
C)communicating current system knowledge of users through data flow diagrams
D)conceptual freedom found in the use of the four symbols

Question 14

The advantage of building data flow diagrams based on events is that:

A)events are small scale and easy to analyze for input and output.
B)users are familiar with the events within their business and know how the events drive other activities.
C)events fall into one of four categories: read, update, create, delete.
D)events are predictable and lend a high degree of stability to the data flow diagram.

Question 15

Which of the following is not a reason for partitioning processes into separate programs?

A)the processes represent different user groups
B)the processes execute at different times
C)to control system security
D)to maintain consistency of data

Question 16

Which of the following is a goal of dividing a Web site into a series of Web pages?

A)improve the ease of maintaining the Web site
B)improve the collection of Web metrics
C)improve tracking of page movement by the customer
D)improve the revenue obtained by page marketing

Question 17

Which of the following is not an error when drawing a data flow diagram?

A)all data flowing into a process or out of a process
B)data flow on a child diagram that has only one end connected to a process, the other end is a point in space
C)connecting data stores and external entities directly to each other
D)placing more than nine processes on a data flow diagram

Question 18

The process of creating a simple data flow diagram fragment for each unique system trigger is called:

A)event modeling.
B)trigger analysis.
C)response cases.
D)CRUD model analysis.

Question 19

Which of the following is not an advantage of using a logical model?

A)A system based on a logical model is more stable.
B)The logical model helps the analyst understand the business being studied.
C)It facilitates communication with the users.
D)A logical model clarifies which processes are automated.

Question 20

Which graphically characterize(s)data processes and flows through a business system?

A)data dictionary
B)data flow diagrams
C)structured analysis
D)design

Question 21

While the first ________ diagram helps the systems analyst grasp basic data movement, its general nature limits its usefulness.

A)context
B)concept
C)user interface
D)design

Question 22

Each time an external company or system is involved:

A)the processes that handle each of the interactions should be partitioned into one program for security reasons.
B)a new temporary data store must be used with a process to create the data store.
C)the process that handles the interaction must be on a secure server.
D)the process involved needs to be partitioned into a separate program.

Question 23

Data flows occurring simultaneously can be depicted doing just that through the use of ________ arrows.

A)perpendicular
B)segmented
C)connecting
D)parallel

Question 24

Having separate Web forms to collect transaction data means that:

A)the forms are each quite complex with complex validation.
B)the forms are less complex and easier to fill out.
C)the processing will take place slowly.
D)the Web site will not be as attractive.

Question 25

When the first ________ diagram is made, inputs and outputs are specified and these remain constant throughout all of the following diagrams.

A)concept
B)user interface
C)design
D)context

Question 26

The biggest advantage of the data flow approach lies in the conceptual freedom found in the use of the four symbols.

Question 27

With a ________ approach, the diagrams move from general to specific.

A)top-down
B)bottom-up
C)management-centered
D)employee-centered

Question 28

Which of these are reasons for partitioning a system?

A)to keep transactions secure
B)to make it easier to move to a new system
C)to allow the system to be upgraded later
D)to ensure that if the business is sold, the data can be given to the new owners

Question 29

Ajax is used to:

A)partition Web sites into different Web forms.
B)obtain data from a Web server and update the current Web form.
C)confirm credit card accounts using a secure transaction.
D)transmit data to an external partner using XML documents.

Question 30

By using combinations of only four symbols, the systems analyst is able to create a pictorial depiction of data flows that eventually can provide solid system ________.

A)documentation
B)modeling
C)programming
D)answers

Question 31

Each external entity is labeled with a noun.

Question 32

The data store symbol is simply showing a depository for data which allows addition or ________ of data.

A)retrieval
B)removal
C)updating
D)deletion

Question 33

An external entity is called a source or ________ of data, and is considered to be external to the study.

A)destination
B)result
C)answer
D)confusion

Question 34

What should be created each time data must be obtained from an external partner?

A)a transaction data store
B)a new browser window and DFD process to validate the window's data
C)a unique Web form and DFD process to validate and process the data
D)a Web form that extends the previous Web form

Question 35

An arrow is used to depict an external entity that can give and receive data from the system.

Question 36

The data flow diagram may be used to analyze the proposed system.

Question 37

A method that provides conceptional freedom for representing processes and flows in a business system is the ________.

A)database
B)entity-relationship diagram
C)data flow diagram
D)flow chart

Question 38

The data flow diagram graphically characterizes data processes and flows in a business system.

Question 39

________ depict the broadest possible overview of system inputs, processes, and outputs.

A)Data flow diagrams
B)Databases
C)Entity-relationship diagrams
D)Flow charts

Question 40

The data flow approach enables the systems analyst to better understand the interrelatedness of ________ and ________.

A)systems; subsystems
B)systems; programming
C)subsystems; programming
D)subsystems; diagrams

Question 41

Data flow diagrams must be drawn working from left to right on the page.

Question 42

In logical data flow diagrams, the type of physical storage is unspecified.

Question 43

Unbalanced decomposition means that the data flow to or from a parent process does not match the data flow in or out of a child diagram.

Question 44

A logical data flow diagram shows how the business operates.

Question 45

The highest level data flow diagram is called Diagram 0.

Question 46

A physical data flow diagram shows how the system will be constructed.

Question 47

Transaction files are used to link all logical data flow diagram processes.

Question 48

Processes in a rectangle with rounded corners sometimes denote something other than a change in or transformation of data or a system/subsystem.

Question 49

A rectangle with rounded corners is used to show the occurrence of a transforming process.

Question 50

Data stores must always have data flow into them in a proper diagram.

Question 51

Processes that transform data should be named with a noun which indicates the data that has been transformed.

Question 52

Ajax may be used to obtain data for a Web form without changing Web pages.

Question 53

Linear data flow from process to process is normal in higher level data flow diagrams.

Question 54

More detail is achievable through using a process called "exploding the diagrams."

Question 55

A use case summarizes an event and defines one activity.

Question 56

A CRUD matrix is a tool used to represent where master files are read, updated, created, and deleted within the system.

Question 57

The systems analyst needs to conceptualize data flows from a top-down perspective.

Question 58

With a top-down approach, the diagrams move from specific to general.

Question 59

Having separate Web forms means that the forms will become more complex.

Question 60

The name of the data flow coming out of a process should be different than the name of the data flow going into the process.

Question 61

A clear name on a data flow diagram makes it easier to understand what the process is accomplishing.

Question 62

Each time an external company or system is involved in the activities of a Web site, the process that handles them must be left alone without any partitioning.

Question 63

Base elements are elements that need to be keyed into the system.

Question 64

Base elements are elements that are created by a process using a formula or some logic.

Question 65

What is the difference between a logical and physical data flow diagram?

Question 66

Balanced decomposition is when the data flow in or out of a child diagram does not match the data flow in or out of a parent process.

Question 67

A basic process is one that does not explode to a child diagram.

Question 68

What are the four advantages of using a data flow approach over narrative explanations of data movement?

Question 69

Effective labels on data flow diagrams is a top priority.

Question 70

A logical data flow diagram focuses on how the business operates.

Question 71

When a process has all input or all output data flow, it means that an arrowhead is pointing in the wrong direction or there is a missing data flow.

Question 72

Partitioning data flow diagrams is the process of deciding which processes are manual procedures and which processes should be grouped into which computer programs.

Question 73

A physical data flow diagram shows how the system will be implemented.

Question 74

A CRUD matrix shows where records are added, changed, used, and deleted from a file.

Question 75

Describe each of the four data items that can be symbolized on a data flow diagram?

Question 76

A transaction file links two processes that execute at different times.

Question 77

A use case summarizes an event and defines one activity, its trigger, input and output.

Question 78

Ajax is a technique used to obtain data from a server and update large amounts of data using UML.

Question 79

List three of the five advantages of a logical data flow diagram.

Question 80

Why is partitioning useful when designing a Web site?