From the course: Software Design: Modeling with UML

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Sequence and communication diagram

Sequence and communication diagram - Unified Modeling Language (UML) Tutorial

From the course: Software Design: Modeling with UML

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Sequence and communication diagram

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- [Instructor] Interaction diagrams model the dynamic behavior of a system, focusing on interaction among the entities within a system. There are four kinds of interaction diagrams, and I will discuss sequence and communication diagrams in this lesson. Sequence diagrams are not only one of the most widely-used interaction diagrams, but also one of the most popular UML diagrams as well. They capture the dynamic view of the system in terms of the sequence of interaction among its entities. They help capture the communication among classes, and through that, help us identify the behavior that we need to implement in the code. A sequence diagram is read in two directions: from top to bottom, and then horizontally, from left to right or right to left, depending on the direction of the arrows. There are several elements in a sequence diagram. The most important and frequently used ones are: participants, their lifelines,…

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