Question 1

The first step in drawing a communication diagram is to identify which objects and associations between the objects participate in the communication.

Accepted Answer

The answer of The first step in drawing a communication...

Question 2

The initial state in a behavioral state diagram represents the point at which the object begins to exist.

Accepted Answer

The initial state in a behavioral state diagram signifies the starting point or condition of an object before any events have affected it, essentially when it begins to exist in the context of the diagram.

Question 3

It is possible for an object to create another object, resulting in the message going directly to the object, not its lifeline.

Accepted Answer

This is possible in object-oriented programming using methods such as factory methods or builder patterns. In these cases, the object creating the new object is responsible for sending messages directly to the newly created object, rather than going through its own lifeline.

Question 4

A sequence diagram can only be drawn to represent a single scenario in a use case.

Accepted Answer

A sequence diagram can be used to represent multiple scenarios within a use case, including alternative paths and exceptions, by using different interaction fragments such as alt, opt, and loop.

Question 5

Each object can both send and receive messages.

Accepted Answer

In object-oriented programming, objects have both properties and behaviors. One of the behaviors of an object is sending and receiving messages. Therefore, each object can both send and receive messages.

Question 6

CRUD matrices are created by creating a matrix that lists the classes across the top and down the side.

Accepted Answer

This statement is true. A CRUD matrix is a tool used in software development to identify which classes in a system will create, read, update, or delete data in other classes. The matrix is created by listing the classes across the top and down the side, with each cell indicating whether a particular class can perform a CRUD operation on another class.

Question 7

Modeling the real world in behavioral models is relatively easy.

Accepted Answer

Modeling the real world in behavioral models can be challenging as it involves understanding complex behaviors and interactions between various entities. It requires careful observation and analysis of real-world phenomena to create accurate behavioral models.

Question 8

A message with the information [aStudent exists] will be sent only when this condition is true.

Accepted Answer

The message "aStudent exists" will be sent only if the condition for its existence is true. Otherwise, the message will not be sent.

Question 9

Conditions on conditional messages in communication diagrams are placed in [ ] symbols.

Accepted Answer

This is true. Conditions on conditional messages in communication diagrams are placed in [ ] symbols.

Question 10

In a CRUD matrix, C represents Create.

Accepted Answer

Yes, C in a CRUD matrix stands for Create. The complete acronym stands for Create, Read, Update, and Delete, which are the four basic operations that can be performed on a database or data storage system.

Question 11

The behavioral state diagram shows the different states that an object passes through in response to events, together with its responses and actions.

Accepted Answer

The statement is true, the behavioral state diagram does show the different states an object passes through in response to events.

Question 12

Actors and objects are placed on a sequence diagram in no particular order.

Accepted Answer

Actors and objects are not placed in any specific order on a sequence diagram. However, the order of the messages sent between them should follow a logical sequence.

Question 13

If you are interested in the time ordering of the messages in a system, you should use a communication diagram.

Accepted Answer

Sequence diagrams, not communication diagrams, are primarily used to focus on the time ordering of messages in a system.

Question 14

When an object sends a message to itself, it is called self-messaging.

Accepted Answer

The answer of When an object sends a message to...

Question 15

When creating a CRUD matrix, you should use the letter U to represent Underline.

Accepted Answer

There is no standard convention of using the letter U to represent Underline in a CRUD matrix. The typical symbols used are C (create), R (read), U (update), and D (delete).

Question 16

A set of rules are used for performing the verification and validation walkthrough of behavioral model. One of the rules is: all _______________ contained in a behavior state machine must be associated with a message being sent on a sequence and communication diagram, and it must be classified as a (C)reate, (U)pdate, or (D)elete message in a CRUDE matrix.

Accepted Answer

The rule mentioned specifically relates to transitions in a behavior state machine and requires that they be associated with a message and classified as CRUD. Therefore, the correct answer is C (transitions).

Question 17

A set of rules are used for performing the verification and validation walkthrough of behavioral model. One of the rules is: all entries in a CRUDE matrix imply _____________ being sent from an actor or object to another actor or object

Accepted Answer

A CRUDE matrix (stands for create, read, update, delete, and examine) is a technique used to verify the completeness and correctness of the behavioral model. It maps the actors and objects of the system with their allowed operations or actions. In this context, all entries in the CRUDE matrix must represent the sending or reception of a message between actors or objects. Therefore, the correct choice is A) a message.

Question 18

Both the communication diagram and the sequence diagram can show return messages.

Accepted Answer

The answer of Both the communication diagram and the sequence...

Question 19

The destruction of temporary objects is shown on sequence diagrams with an X at the end of the lifeline.

Accepted Answer

In UML sequence diagrams, the destruction of temporary objects is indeed represented by an X at the end of their lifeline, indicating the point at which they are destroyed or go out of scope.

Question 20

As behavioral models are developed, it is likely that the use cases and structural models will have to be modified.

Accepted Answer

Behavioral models specify the dynamic behavior of a system, and as they are developed, the understanding of the system's functionality may change, resulting in modifications to the use cases and structural models. It is important to ensure that all models are consistent with each other as they are refined and updated throughout the development process.

Quiz 6: Behavioral Modeling