UML 2 has addressed this problem by removing the “in-line” guard and adding a notation element called a Combined Fragment. Swim lanes are a UML notation used on activity diagrams.)

Figure 7 shows a fragment of a sequence diagram with a guard on the message addStudent method.In Figure 7, the guard is the text “[pastDueBalance = 0].” By having the guard on this message, the addStudent message will only be sent if the accounts receivable system returns a past due balance of zero.

When does an object call itself? If more alternatives are needed, all you must do is add an operand to the rectangle with that sequence’s guard and messages.The option combination fragment is used to model a sequence that, given a certain condition, will occur; otherwise, the sequence does not occur. These can help to predict how a system will behave and to discover responsibilities a class may need to have in the process of modeling a new system. In addition to hiding the lifeline in the interaction occurrence, UML 2 also specifies that the lifeline must have the same theirBank in its own “Balance Lookup” sequence.There will be times when you model sequence diagrams that an interaction occurrence will overlap lifelines that are In Figure 11, the sequence references the “Balance Lookup” sequence diagram. Because the example sequence has parameters and a return value, its label —located in the diagram’s namebox—follows a specific pattern:Figure 12 illustrates example 1, in which the Balance Lookup sequence uses parameter accountNumber as a variable in the sequence, and the sequence diagram shows a Real object being returned. When the oven object receives that message, it sends two messages to itself at the same time (nukeFood and rotateFood). Much like the class diagram, developers typically think sequence diagrams were meant exclusively for them. "An example scenario is presented to demonstrate how a common issue tracking system would work: We can also use the terms event diagrams or event scenarios to refer to a sequence diagram. The exit gate is known, because it’s a return message that is connected from a lifeline to the diagram’s frame with the arrowhead connected to the frame.In the “basics” section presented earlier in this paper, I covered the combined fragments known as “alternative,” “option,” and “loop.” These three combined fragments are the ones most people will use the most. I want you to finish this piece in one day! (Note: Although operands look a lot like lanes on a highway, I specifically did not call them lanes. With these you can combine (reuse) the simpler sequences to produce more complex sequences. These return messages are optional; a return message is drawn as a dotted line with an open arrowhead back to the originating lifeline, and above this dotted line you place the return value from the operation. Making and following schedules is a fundamental human activity, and learning to do these things effectively is one of the most basic life skills.

The message/method name is placed above the arrowed line. Subsequent messages are then added to the diagram slightly lower then the previous message.To show an object (i.e., lifeline) sending a message to another object, you draw a line to the receiving object with a solid arrowhead (if a synchronous call operation) or with a stick arrowhead (if an asynchronous signal).

The larger rectangle is then divided into what UML 2 calls operands. During the design phase, architects and developers can use the diagram to force out the system’s object interactions, thus fleshing out overall system design.Consistently deliver high-quality software faster using One of the primary uses of sequence diagrams is in the transition from requirements expressed as use cases to the next and more formal level of refinement. "A sequence diagram is an interaction diagram that shows how processes operate with one another and in what order. The loop in this sequence diagram uses a Boolean test to verify if the loop sequence should be run. The process of creating a schedule - deciding how to order these tasks and how to commit resources between the variety of possible tasks - is called scheduling, and a person responsible for making a particular schedule may be called a scheduler.

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