What you should be able to do
- Choose classes from responsibilities, not nouns alone.
- Distinguish association, aggregation, composition and inheritance.
- Use multiplicity to state a real constraint.
02 / REQUIREMENT ENGINEERING AND ANALYSIS MODELING / L12
Class Diagrams
A class diagram describes static structure. It does not replay the order of messages or copy database tables blindly.
What stable objects and relationships support the selected scenario?
Terms to use precisely
Common mistakes
- Adding every UI field as an attribute.
- Using composition when objects can exist independently.
- Leaving multiplicities out when they affect the design.
INTERACTIVE UML LAB
Take this idea into the diagram.
The lab uses familiar systems so you can inspect every actor, relationship, message and ownership handoff.
CHECKED LEARNING LINKS
Watch the part that solves the gap.
Each link is matched to this lesson. Start with a quick video when available. Open the full lecture when you need the academic explanation.
WATCH FIRSTquick video
UML Class Diagram Tutorial
Review classes, attributes, methods and relationship notation before opening the studio.
GO DEEPERfull lecture
Lecture 33: Overview of Class Diagram
Start with classes, attributes, operations and relationships.
GO DEEPERfull lecture
Aggregation, Composition and Dependency Relations
Use this when ownership and relationship notation are unclear.