In the sequence diagram with the analysis objects for this use cases, there is a message votePost(user, post, vote).
4: the system throws a visual feedback to indicate that the operation has been performed successfully. If the post was already voted by the user, the system will override the old vote with the new one. 3: the system registers the vote cast by the user. 2: the user clicks the dedicated button, according to the vote he intends to cast that can be either a negative or positive vote. 1: the user reaches the posts ( includes "View Post" use case). Postcondition: the post is voted by the user Precondition: the user must be logged and the post the user wants to vote exists Once you list down all the objects, actors, lifelines, and messages you get a complete visual representation of how a system works.I'm drawing some sequence diagrams to give a graphical depiction of the use cases written during the requirements elicitation phase for my project. Sequence diagrams show the order of interaction in a system by moving down the lifeline with each message. Messages are notations that show the information being sent between objects. This involves thinking of all the steps an actor must complete for a given task. Now start visualizing the interactions actors have with objects. Moving down a lifeline means more time is passing. Create lifelines that represent the existence of an object or actor over time. In a sequence diagram, actors are represented by stick figures and objects are represented by rectangles. While creating a sequence diagram the first step is to identify all the objects that will participate in the system. It comes with specific shape libraries with sequence diagram notations and easy drag and drop functionality to visualize lifelines, actors and how they interact with each other. Creately’s sequence diagramming tool allows you to create detailed sequence diagrams. 
Sequence Diagrams are used to design, document, and validate the architecture, interface and logic of systems by describing the sequence of actions that need to be performed to complete a task. More Templates What Is a Sequence Diagram?Ī sequence diagram is a UML diagram type that represents how and in what order objects in a system interact with each other.
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