A sequence diagram is a type of interaction diagram that highlights the interdependencies between messages.
Two possible sequence diagrams
Sequence Diagram Notations
This symbol marks the object that initiates the message.
Learn how to drop these ovals on the line.
Duration notations indicate the length of time needed to complete a task.
Use arrows or lines to represent communication between objects. Use half-arrowed lines to represent asynchronous messages. Asynchronous messages are sent from an object that will not wait for a response from the receiver before continuing its tasks.
Learn how to connect two objects.