T6 - Sequence Diagram

Question 1

Describe dynamic modeling and its relationship with behavioral and structural
modeling

Answer 1

Static modeling is used to specify the structure of the
objects and the design of classes
Time: does not matter:
CLASS, OBJECT and USECASE diagrams.

Dynamic modeling refers to represent the object
interactions during runtime
Time does matter:
SEQUENCE,ACTIVITY, COLLABORATION diagrams

Question 2

Briefly describe a sequence diagram
> What does the vertical axis represent
> What does the horizontal represent

Answer 2

A sequence diagram represents the interaction between
objects,
or between actors
Overtime
Vertical axis is a timeline,
horizontal access identifies the space and the
actions that take place within the space

Question 3

Define “asynchronous message.”

Answer 3

asynchronous event is one in which the action that

triggers the event and the event itself are not within a common timeframe

Question 4

What are combined fragment

Answer 4

Each
combined fragment has one operator, one or more operands, and zero or more guard
conditions.

opt, alt, loop, break and ref

Question 5

Brief descibe the following
Collaboration Diagram
State chart diagram
Activity Diagram

Answer 5

Collaboration diagram: how various software objects interact with each other within an overall IT architecture

State chart diagram: Shows different states of an object during its lifetime and these states are changed by events

Activity diagram: represent the flow from one activity to another activity. The activity can be described as an operation of the system.

Question 6

Explain what is a lifeline

Answer 6

Lifelines represent either roles or object instances that participate in the sequence being modeled