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Sequence Diagram is a model describing how groups of objects collaborate in some behavior over time which captures the behavior of a single use case. It often shows objects and the messages that are passed between these objects for the particular use case which can be used to model:
Sequence Diagrams are interaction diagrams that detail how operations are carried out. Interaction diagrams model important runtime interactions between the parts that make up the system
Sequence Diagram is an interaction diagram that details how operations are carried out -- what messages are sent and when. Sequence diagrams are organized according to time. The time progresses as you go down the page. The objects involved in the operation are listed from left to right according to when they take part in the message sequence.
Below is a sequence diagram for making a hotel reservation. The object initiating the sequence of messages is a Reservation window.
Note That: Class and object diagrams are static model views. Interaction diagrams are dynamic. They describe how objects collaborate.
But even with all these benefits above, Visual Paradigm Community is free for all sorts of non-commercial use, since 2004, and for now & forever!
A scenario is one path or flow through a use case that describes a sequence of events that occurs during one particular execution of a system. Sequence diagrams often be used to assist for elaborating use cases by emphasizing message exchange. The various scenarios of a use case can be depicted by a sequence diagram. The representation is restricted to the message exchange within each business use case. Generally, the level of detail for these sequence diagrams is higher than for sequence diagrams spanning use cases.
A use case is a collection of interactions between external actors and a system. In UML, a use case is "the specification of a sequence of actions, including variants, that a system (or entity) can perform, interacting with actors of the system." Typically each use case includes a primary scenario ( or main course of events) and zero or more secondary scenarios that are alternative courses of events to the primary scenario
User requirements are captured as use cases that are refined into scenarios. A use case is a collection of interactions between external actors and a system. In UML, a use case is:
"the specification of a sequence of actions, including variants, that a system (or entity) can perform, interacting with actors of the system."
A scenario is one path or flow through a use case that describes a sequence of events that occurs during one particular execution of a system which is often represented by a sequence diagram.
Sequence diagrams can be somewhat close to the code level, so why not just code up that algorithm rather than drawing it as a sequence diagram?
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