Activity Diagram

Question 1

What is an Activity Diagram?

Answer 1

Allow to model the flow of control of a procedure. They are a form of flowchart but can show a lot more then just a sequence of actions.

Question 2

What can Activity Diagrams be used for?

Answer 2

Used to describe workflows but can also be used to support a Use Case.

Question 3

What is an Initial Node?

Answer 3

Indicated where the control flow of the activity begins. (a black dot)

Question 4

What is an Activity Final Node?

Answer 4

indicates where the activity finishes. (black dot surrounded by a circle).

Question 5

What is an Action Node?

Answer 5

Indicates an action within the control flow. (a box)

Question 6

What is an Activity Node?

Answer 6

Indicates an activity of lower level. (a box with a trident inside).

Question 7

What is an Activity Edge?

Answer 7

Indicates a control flow, shows a sequence of actions, it can also be an updated. (an arrow)

Question 8

What is a Guarded Edge?

Answer 8

Indicated a condition that must be true for the flow to occur. (an arrow with brackets indicating the condition).

Question 9

What is a Decision Node?

Answer 9

Test the data, and routes the activity along the appropiate guarded edge.

Question 10

What is a Merge Node?

Answer 10

Indicates where 2 or more flows converge on an XOR basis.

Question 11

What is an OR in an Activity Diagram?

Answer 11

Represtented by a Merge node and two activities merging in.

Question 12

What is an And in an Activity Diagram?

Answer 12

Allows for two or more actions to happen at the same time it is represtented by a thick black line.

Question 13

What are Partitions in an Activity Diagram?

Answer 13

Bands that partition an acitivity diagram, they can represent departments, locations, roles or system. (swimlanes).

Question 14

What is a Flow Final?

Answer 14

Terminate a specific flow not the entire activity. (a circle with an x in the centre).

Question 15

What is a Send Signal?

Answer 15

An action in which a signal/message is sent - they are asynchronous meaning the activity won’t stop or wait. (a box with a triangle).

Question 16

What is an Accept Event?

Answer 16

An action which acts as a trigger. It captures the signal/message. (a box with an indward triangle).

Question 17

What is Time?

Answer 17

They represent time, e.g. send invoice at 3pm. (labelled as a hour glass symbol).

Question 18

When should we not use a Flow Final?

Answer 18

An example is two people buying tickets and queing, we don’t care for the flow to continue, we’ll be happy once one of the persons gets the ticket.

Question 19

What is an Interruptible Region?

Answer 19

An area within the activity that can be intterupted by some event. (a dashed box).

Question 20

What is an Interruption Edge?

Answer 20

Used to show a move from the interruptible region to some action. (a zigzag arrow).