Question 1

When a context diagram is expanded into data flow diagram (DFD)diagram 0,all the connections that flow into and out of process 0 must be retained.

Accepted Answer

When a context diagram is expanded into DFD diagram 0, all inputs and outputs of the process at the center of the context diagram (represented as 0) must be included in DFD diagram 0. Retaining these connections ensures that the data flow is properly modeled and no information is lost in the process.

Question 2

In data flow diagrams (DFD),systems analysts call an entity that supplies data to the system a sink.

Accepted Answer

In data flow diagrams (DFD), an entity that supplies data to the system is called a source, not a sink. A sink is an entity that receives data from the system.

Question 3

In a data flow diagram (DFD),a data flow must have a process symbol on at least one end.

Accepted Answer

This is because a data flow represents the movement of data between processes, and at least one end must be a process symbol to indicate where the data is coming from or going to.

Question 4

A decision tree is read from left to right,with the conditions along the various branches and the actions at the far left.

Accepted Answer

A decision tree is read from top to bottom, with conditions at each node and actions or outcomes at the leaves (bottom).

Question 5

The only disadvantage of the four-model approach is the added time and cost needed to develop a logical and physical model of the current system.

Accepted Answer

The statement is true, as developing both logical and physical models for the current system can take additional time and resources compared to just developing a single model.

Question 6

The primary purpose of pseudocode is to describe the underlying business logic of code.

Accepted Answer

The answer of The primary purpose of pseudocode is to...

Question 7

In the systems design phase,a logical model is built that describes how the system will be constructed.

Accepted Answer

The systems design phase involves creating a physical model that describes how the system will be constructed, while the logical model is typically developed during the systems analysis phase.

Question 8

In a data flow diagram (DFD),a process symbol can have only one outgoing data flow.

Accepted Answer

A process symbol can have multiple outgoing data flows, representing the output generated by the process.

Question 9

What makes one system more complex than another is the number of components,the number of levels,and the degree of interaction among its processes,entities,data stores,and data flows.

Accepted Answer

The definition given in the statement is correct and accurate, making option A the correct answer.

Question 10

Deciding whether to explode a process further or determine that it is a functional primitive is a matter of experience,judgment,and interaction with programmers who must translate the logical design into code.

Accepted Answer

The decision of whether to further explode a process or determine it as a functional primitive requires experience, judgment, and interaction with programmers. This shows that the statement is true.

Question 11

In a data flow diagram (DFD),the name of the process appears inside a rectangle.

Accepted Answer

The name of the process does appear inside a rectangle in a data flow diagram.

Question 12

When a data flow diagram (DFD)is exploded,the higher-level diagram is called the child diagram.

Accepted Answer

In a data flow diagram (DFD), when a diagram is exploded, the higher-level diagram is referred to as the "parent" diagram, while the more detailed, lower-level diagram is called the "child" diagram.

Question 13

In DFDs,a process symbol can be referred to as a white hole,because the inputs,outputs,and general functions of the process are hidden,but the underlying details and logic are known.

Accepted Answer

A process symbol in DFDs is actually referred to as a black hole, not a white hole. This is because the input/output/process details are not visible, similar to how a black hole absorbs everything without emitting any visible light.

Question 14

Processes contain the business logic,also called business rules,which transforms the data and produces the required results.

Accepted Answer

Processes contain the instructions for how the data should be manipulated to achieve the desired outcomes or results, which is also known as business logic or business rules.

Question 15

In a data flow diagram (DFD),systems analysts call an entity that receives data from the system a source.

Accepted Answer

In a data flow diagram (DFD), an entity that receives data from the system is called a sink, not a source. A source is an entity that generates data and sends it to the system.

Question 16

The end product of data and process modeling is a logical model that will support business operations and meet user needs.

Accepted Answer

The end product of data and process modeling is a logical model that represents the organization's operations and meets user requirements. This logical model serves as the blueprint for the physical implementation of the system.

Question 17

Data stores are shown in a context diagram because data stores are external to the system.

Accepted Answer

Data stores are internal to the system and represent where data is stored within the system, not external entities.

Question 18

When a data flow diagram (DFD)is exploded,the lower-level diagram is referred to as the parent diagram.

Accepted Answer

When a DFD is exploded, the lower-level diagram is referred to as the child diagram, and the higher-level diagram is referred to as the parent diagram.

Question 19

A data flow diagram (DFD)does not show the external entities that provide data to the system or receive output from the system.

Accepted Answer

A DFD includes external entities that provide data to the system or receive output from the system. These entities are typically represented as squares on the diagram.

Question 20

Processes are generally very simple.

Accepted Answer

Processes can be very complex and involve multiple sub-processes and decision-making steps.

Quiz 5: Data and Process Modeling