HOW TO CREATE AND UNDERSTANDING SEQUENCE DIAGRAMS?The Unified Modeling Language (UML) is currently the standard notation for modeling software-intensive systems. In UML, sequence diagrams are typically used to describe system dynamics. Sequence diagrams depict system dynamics by showing the participating objects (classes, components, etc.) in the interaction and the sequence of messages exchanged. A sequence diagram has two dimensions: the vertical dimension represents time and the horizontal dimension represents the objects participating in the interaction. Time flows from top to bottom. Objects (or classifier roles, more generally) are shown as vertical lines (called lifelines) and messages as horizontal arrows extending from a sender object to a receiver object. Spacing is irrelevant,that is, only the order of messages matters, not the distance between them.
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