Analysis Class Diagrams
PB007 Software Engineering I
Bruno Rossi
11.11.2020
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Analysis Class Diagram
A Class Diagram is a static view of the classes, their attributes,
operations and relationships.
The Analysis Class Diagram shows the analysis classes that represent the
concepts in the business domain of the system to be modelled, i.e. it does
not go into the implementation details.
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Properties of analysis classes
Good designed analysis classes should have the following
characteristics:
a name that reflects well the purpose;
they have a small number (3-5) of responsibilities/operations;
they are not isolated from other classes;
have high cohesion;
Example: class ShoppingCart, operations addItem(), removeItems(),
displayContents(), receiptOfPayment(),printInvoice()
they have few links to other classes (coupling);
Be careful about:
a large number of small classes;
a small number of very large classes;
functions/procedures that are created as separate classes;
classes that govern/manage other classes. Often they are called
system, controller, or manager;
a complex inheritance hierarchy (max 2 levels);
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Finding Analysis Classes
Analysis of nouns and verbs:
gathering available resources (specifications, documentations, use
cases, ...);
nouns are candidates for class or attributes;
verbs or verb patterns are candicate for methods/operations within
classes;
watch out for hidden classes/concepts;
CRC (Class, Responsabilities, Collaborators) Analysis
group activity involving brainstorming;
on a card that represents one class, you can add the class name, the
responsabilities and the collaborators (other classes that are in
relation with the class);
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Relations between classes
The basic relationships include:
Generalization
Association
Dependency
Association is the semantic relationship between classes.
It is represented by the following attributes:
name
name of roles
multiplicity
navigability of associations
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Relations between classes II
Name of the association and names of roles:
You can only use one option, not both. Generally the name of the
association is preferred, but it depends if you want to specify the names of
the roles to make the relationships clearer.
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Relations between classes III
Multiple and reflexive associations:
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Relations between classes IV
Association class:
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To generate a class diagram
1 Find classes, basic attributes, operations and co-workers
2 Determine inheritance levels between classes
3 Capture relationships by means of associations
4 Name associations or roles
5 Determine the multiplicity of associations
6 Capture dependencies
7 Add additional attributes and operations that are in the domain
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Resources
www.uml.org.cn/umlapplication/pdf/crcmodeling.pdf
www.agilemodeling.com/artifacts/classDiagram.htm
sourcemaking.com/uml/modeling-it-systems/
structural-view/class-diagram
http://sourcemaking.com/uml/modeling-it-systems/
structural-view/constructing-class-diagrams
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Tasks
Correct the mistakes from the previous task;
Look into the specifications for information for the analysis diagrams,
classes, basic attributes, operations and relationships;
Draw the analysis class diagram including inheritance and names of
associations/roles;
Upload the pdf report to the folder (Week 05).
Deadline: Monday, 16.11 23:59
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Customization of PDF Reports
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