![]() Read a sequence diagram from the top down. However, they are still programming language neutral, and thus above the level of actual code. They are are closer to the actual code as they show all cross-system messages. Sequence diagrams extend use-case diagrams - they model the series of events that a scenario or use-case must execute. They are used to plan the development or extension of a software product and complement UML class diagrams, showing which class data is passed between which elements. The events that cross system boundaries are used by objects and people (actors) to complete their processes.Īlso known as system sequence diagrams, they are one of the main types of UML diagrams. You may prefer to focus on the more difficult interactions and the less obvious ones between boundaries and controls) and not loose too much time for very trivial ones.Sequence diagrams show the order of messages that are passed between elements of a system to complete a particular task or use case. Then, in a separate step you can design in UML the interaction between classes involved. This will facilitate discussion with more stakeholders and allow to show much faster the interaction between user-interface elements and the actor. It's like typeing text with a hammer on the keyboard: a very simple UI design like here looks terribly complicated in UML.ĭesign the big picture of the user journey using wireframes, storyboards, or a combination of several techniques and easy-to-understand user flows. ![]() UML is great! But it's the wrong tool for UI design. Last but not least security experts would advise you never to tell that the user name is ok but password incorrect.I wonder if it would not make it much clearer, then, to have two separate (and simpler to read diagrams). Then I wonder if the user could not anyhow click on "Sign up" instead of starting entering the login information.I’d put the second alternate in a nested box in the else operand (i.e.Now, I think you are ready to continue with your modelling and your project. Finally, it also allows to check robustness (see the wikipedia link: database coordinates application logic behind the scene and it would in the BCE logic be a “controller”, and controller should not speak to actors). Then it shows immediately the interaction between UI elements and classes behind the scene. Your revised diagram is much more understandable: first messages for the user now correspond to feedback made by the UI. Edit: your second diagram You're revised diagram I wonder if there would not be a nested alt block. Not fully clear how you want this scenario to work. ![]() You may for example use a stereotype such as «Boundary», or even more concrete ones like «Dialogue window» or «Webpage» (you may freely define those in an ad-hoc profile).
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