UML Composition vs Aggregation vs Association
About the subtle differences between Composition, Aggregation and Association
UML Best Practice: 5 rules for better UML diagrams
Learn how to make better UML diagrams
UML Best Practice: Attribute or Association
When to use an attribute and when an assocation
UML Best Practice: One Operation => One Sequence Diagram
Each operation’s behavior specified in a single sequence diagram
UML Best Practice: There are no Activities on an Activity Diagram
How to avoid the most common error when dealing with Activity Diagrams