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You also need to identify the cardinality and optionality of a relationship (the UML combines the concepts of optionality and cardinality into the single concept of multiplicity). ” For example, it is not enough to know that customers place orders. How many orders can a customer place? None, one, or several? Furthermore, relationships are two-way streets: not only do customers place orders, but orders are placed by customers. This leads to questions such as: How many customers can be enrolled in any given order and is it possible to have an order with no customer involved?

Associations may have roles indicated, for example the mentors association, a recursive relation that professor objects have with other professor objects, indicates the roles of advisor and associate. A design class model would show greater detail. For example, it is common to see the visibility and type of attributes depicted on design class diagrams as well as full operation signatures. Tip What happens if you’re not developing business applications, are there different core diagrams? Yes. For real-time or embedded systems, the core diagrams are typically UML state chart diagrams, UML communication/ collaboration diagrams (or UML sequence diagrams, depending on your team’s preference), and UML class diagrams.

Stylistically, the name of this class should either be the database or the name of the package within the database. Note Although it is standard UML practice for stereotypes to be singular, in this case the plural form makes the most sense. The other alternative is to apply the stereotype <> to each individual operation signature, something that would unnecessarily clutter the diagram. Modeling Sections within a Database Many database-management systems provide the ability to segregate your database into sections.