Software revision memorisation

System

 what is being described

actor

who interacts with the system

Use cases

what the actors can do

Primary actor

benefit of execution of the use case

Secondary actor

receives no direct benefit 

Active

initiates execution of use cases 

Passive

 provides functionality for the execution of use cases 

Base use case

behaviour of included use case offer its functionality

Included use case

other use cases in system share it 

Extension point

what point behaviour is integrated 

Condition

what circumstances the behaviour is integrated

Relationship between use cases (1)

Use case A generalise case B

Relationship between use cases(2)

B inherits the behaviour and relationship  of A

Relationship between use cases (3)

B adopts the basic functionality of A

Relationship between Actors (1)

Actor A inherits from actor B 

Relationship between Actors (2)

A can communicate with x and y

Relationship between Actors (3)

B can only communicate with y

Pre condition

 prerequisite for successful execution

Postcondition

System state after successful execution 

Error situations

 error relevant to the domain

Trigger

event initiates the use case

Standard process

individual steps to be taken 

Alternative process

deviations from the standard process 

Association

relationship between use case

Generalisation

 Inherits relationship between use case or actor

Extended relationship

Optional use of use case B by use case A 

Included relationship

required use of use case B by use case A 

Class

construction plan for a set of similar objects of a system

Objects

instances of classes

Attributes

Structural characteristics of a class 

Operations

behaviour of a class 

+...public

everybody

-...private

 only the object itself

#...protected

class itself and subclass

~...package

classes that are in the same package

pre defined

Boolean , integer , Unlimited natural , string

user defined

primitive

Default value

 used if attribute value is not set

In…input parameter

 value expected from the parameter

Out…output parameter

 parameter adopted a new value

Inout

combined input and output parameter

Instance variable

attributes defined on instance level

Class variable

Defined only once per class

Class operation

 used if no instance of the responding class is created

Association

 relationship between classes and instances

Binary association

connection of two classes with one another

Navigability

can access partner visible attributes and operations

multiplicity

number of objects associated with exactly one object of the opposite side

Role

how object is involved in association relationship

N-ary association

more than two partner  objects are involved in the relationship

Association class

modelling many to many associations when relationships has additional parameters

Aggregation

express class is apart of another class

Transitive

if B is part of A and C is part of B , C is also a part of A 

Asymmetric

part A cant be apart of part B and vice-versa simultaneously

Aggregation

weaker form of whole part relationship

Composition

strong exclusive whole part relationship 

Shared aggregation

weak belonging of parts to a whole

Multiple inheritance

class may have multiple super classes

Class

Description of structure and behaviour of a set of objects

Abstract class

class that cannot be instantiated

Xor relationship

an object c is in a relationship either with A or B but not both

Shared aggregation

A is part of B

Composition

 Existence dependent part whole relationship 

Generalisation

 A inherits from B

Synchronous message

sender waits until it receives a response message

Asynchronous message

sender continues without waiting for a response message

Response message

omitted if content and location are obvious 

Found message

Sender of a message is unknown or not relevant

Lost message

Receiver of a message is unknown or not relevant

Filled arrowhead

synchronous call

Open arrowhead

asynchronous call

Dashed line

Returns message

Dashed arrow to the top of a lifeline head

create

Big × at end of lifeline

destroy

Solid thin rectangle on lifeline

activation bar

black dot origin

found message

black dot at end

lost message

Activity

specify user defined behaviour

Edges

 Connect activities and actions to one another

Guards

Control and object flow only continue if the guard evaluates to true Decision node

Parallelization Node/Fork Node

Split path into concurrent subpaths 

Synchronization Node/Join Node

 Merge concurrent subpaths

Connector

Used if two consecutive actions are far apart in the diagram

Exception handling

group of actions whose execution is to be terminated immediately if a specific event occur