According to Srock, (2014) sequence diagram refers to an interaction diagram that indicates how various processes of different objects operate with one another and in what sequence and order. Sequence diagram illustrates the sequence of steps a user performed in any process. The first message in a sequence diagram appears n the top corner while the next message appears below the first message. Sequence diagrams can be used to illustrate different situations such as enrollment in a course, borrowing a book from the library and ordering pizza. Sequence diagrams only illustrate operations and thus, some assumptions are made while creating sequence diagrams.
Enroll in A course
Assumptions made while creating a sequence diagram of enrolling in a course includes; first, it is assumed that the student enrolling for a certain course is registered with the learning institution. Secondly, it is assumed that while enrolling in a course the system is updated and all available courses at the learning institution are displayed. Information regarding any course is displayed on the enrollment portal.
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Borrow a Book from the Library
The first assumption made is that the borrower is a registered member of the library and has the information to log into the library management system. Secondly, it is assumed that the library management system is updated to enable the librarian to search the requested book and get feedback instantly without network delays.
Order Pizza
The main assumption made is that the customer is aware of the ordering system and has a clear idea of what needs to be done ( Sakai, & Aerts, 2014) . It is also assumed that the fast food management system can keep a record of every payment made by each customer. Any staff logged into the system should be able to retrieve all the billing transactions made by the customer.
References
Brooks, F. (2015). Operational Sequence Diagrams. IRE Transactions On Human Factors In Electronics , HFE-1 (1), 33-34.
Srock, C. (2014). The Definition of Sequence Diagram. IEEE Transactions On Industry And General Applications , IGA-2 (2), 98-101.
Sakai, R., & Aerts, J. (2014). Assumptions of Fast Food Sequence Diagrams. BMC Proceedings , 8 (Suppl 2), S9.
