Methods - Models

Question 1

What diagram shows a Process perpective?

Answer 1

Diagram showing how a process works - an activity diagram.

Question 2

What diagram shows a Data perspective?

Answer 2

Diagram showing the data - domain class diagram.

Question 3

What diagram shows an Event perspective?

Answer 3

Diagram showing states/events - state machine diagram.

Question 4

What is Activity Diagram?

Answer 4

Diagram showing processing logic. It can show triggers, events, actors, tasks, decisions and process flows. Mainly used for modelling business processes.

Question 5

What is a Initial Node ?

Answer 5

Indicates where the flow starts.

Question 6

What is a Final Node ?

Answer 6

Indicates where the flow ends.

Question 7

What is a Action Node ?

Answer 7

Shows an action.

Question 8

What is a Activity Node?

Answer 8

Calls an activity diagram corresponding to its name (a sub diagram).

Question 9

What is a Activity Edge?

Answer 9

Points at where the activity can go.

Question 10

What is a Decision Node?

Answer 10

Shows that there must be a decision or can be used to merge nodes.

Question 11

What is a Condition?

Answer 11

A condition that must be true.

Question 12

What are Partitions?

Answer 12

Also known as swimlanes they can respresent departments, locations, roles, or systems.

Question 13

What is a Send Signal Node?

Answer 13

Singlas or messages sent to entities external to the activity.

Question 14

What is a Receive Singla Node?

Answer 14

Signal capturing a triggered event outside the activity.

Question 15

What is a Flow Final Node?

Answer 15

Terminates a flow but not the whole activity.

Question 16

What is a Time Event?

Answer 16

Special form of receive signal. Can be useful to model a wait period.

Question 17

How can an Acitivity Diagram support a Use Case Description?

Answer 17

Instead of modelling the acitivity we can write it down, or vice-versa, or can do both.

Question 18

What is a Class Diagram?

Answer 18

Documents the data requirements of the business domain, providing a basis for the design of felxible, robust database strucutre which enables the sharing of data and controls redundacy so data is collected, recorded, and stored once and once only.

Question 19

What does a Class Diagram define?

Answer 19

The classes (types of things of interest to the business), the associations between classes, the attributes of the classes.

Question 20

What does a Class Diagram model?

Answer 20

The technology that will be used to store the data, the ways in which individual processes require to view the data, any performance constraints.

Question 21

What is a Class?

Answer 21

Anything about which informations needs to be recorded; people and organisations, vehicles, sales, services, places.

Question 22

How is a Class shown?

Answer 22

As a simple rectangular container with its name in the uppermost of its two compartments.

Question 23

What is an Object?

Answer 23

Objects can be considered as real world things - objects are instanges of classes.

Question 24

What is an Attribute?

Answer 24

The things we need to know about the class.

Question 25

What is a Private Attribute?

Answer 25

Attributes of a class that are private, depicted with a ‘+’ sign. They can be accessed only by operations of the same class.

Question 26

What is an Association?

Answer 26

A logical meaningful relationship between two classes.

Question 27

How are Associations shown?

Answer 27

As a simple line between two classes.

Question 28

What is Multiplicity?

Answer 28

Number at each end of an association. Indicate how many instances of one class may be associated with each instance of the other class.

Question 29

How do we check if uses cases are doing something?

Answer 29

This techniques is known as cross checking. We can use a simple CRUD matrix (Create, Read, Update, and Delete) to see what the use case is doing.

Question 30

What is a State Machine Diagram?

Answer 30

Models all the states that a typical object from a domain class may assume during its lifetime.

Question 31

What is a Start State?

Answer 31

Where the State starts ‘e.g. birth’.

Question 32

What is a Transition?

Answer 32

Moves an object from one state to another.

Question 33

What is a State?

Answer 33

The shape/state of an object in a specified period in time.

Question 34

What is an End State?

Answer 34

Where the state completes its lifecycle.

Question 35

What is a Transition and Event?

Answer 35

A transition moves an object from one state to another. The event causing the transition is written on it.

Question 36

What is the U-Curve in State Machine Diagrams?

Answer 36

Modelling of physical and logical, known as the u-curve, from as-is (current physical to current logical) to the to-be (proposed logical to proposed physical).

Question 37

What are Physical and Logical aspects of a system?

Answer 37

Allows us to model WHAT the system does as well as HOW. This is modelled like this; Current physical - current logical - proposed logical - proposed physical.