![]() When you first open Gliffy, you’ll be faced with the option to use a template. Step 1: Find the Right Template (Or Start From Scratch) Watch our sequence diagram tutorial to learn how to make your sequence diagram or follow along with the steps below. It also may be helpful for you to create a use case diagram first, to provide basic structure and context for the flow of the sequence diagram. ![]() The first thing you will need to do before making a sequence diagram is decide on the tool you will use to create it. The “ref” or reference fragment indicates an interaction defined on another diagram.īack to top How to Make a Sequence Diagram The “neg” or negative fragment represents invalid interactions. The “loop” fragment repeats multiple times in a row. The “par” or parallel fragment represents simultaneous paths. The “opt” or optional fragment will either occur or not occur based on the conditions. The “alt” or alternative fragment represents mutually exclusive alternative paths. Here are some of the types of fragments that you might need in order to accurately describe a process in your sequence diagram. They are helpful when managing complex interactions because of the extra context they provide.Ī sequence fragment is a box around a section of the diagram with a label that describes its purpose. Sequence fragments, a new addition to UML 2.0, provide helpful notation to make sequence diagrams more detailed and accurate. Connect notes to objects with a dotted line. Notes are not required and are not an official sequence diagram element, but they can be used to provide additional information as needed. The length of the activation bar depends on the length of activity. Activation barsĪctivation bars are vertical rectangles on a lifeline that make it clear at a glance when each part of the system is active throughout the process. Some systems even have reflexive messages, meaning a lifeline sends a message back to itself, which is shown with an arrow looping back to the original sender. There are a few other, more specific types of messages, such as “create” and “destroy” messages, but the three listed above are the most commonly used in basic sequence diagrams.
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