Communication diagrams differ from sequence diagrams mainly because:

In a component diagram, a provided interface represents:

In UML, two classes need to exchange information frequently but neither should “own” the other. Which type of relationship fits best?

You are told to identify which objects should communicate directly. Which OO concept primarily informs this decision?

A statechart diagram includes composite states. What does this imply?

An activity diagram has a fork creating two parallel tasks, but only one join. What is implied?

A system’s workflow includes conditional tasks, timers, and human approvals. Which advanced behavioral model applies?

In a class diagram, Class A has a composition relationship with Class B. What is the most realistic scenario?

During analysis of a banking system, the analyst identifies “Account,” “Customer,” and “Branch” as concepts. The analyst later discovers that “Account” behaves differently when dealing with overdraft protection. Which OO principle helps avoid rewriting logic for all account types?

You have a use-case diagram where one use case reuses steps from another. Which relationship should be used?