Usually you have classes for the nouns in your use cases, and methods for the verbs.Every oval on the diagram represents a paragraph or two of text telling the story of what's going on. The 'diagram' of any Use Case Diagram is the least useful aspect of use cases.You might be able to Google for the ICONIX process and find details online. This goes through a process exactly what you're describing: how to write good use cases, build class diagrams from them, build sequence diagrams from that, and (ta-da!) code it up into working software. Only the administrator can delete a regular userįirst, if you're determined to go down a modeling path, then I'd recommend a book by Rosenberg and Stephens, Use Case Driven Object Modeling with UML. Only the administrator can delete data from the database. The user will press the logout button, and the system will logout the user Their user name and password will be validated in the same manner as when registering an account.Īny users will beable to input a searchkey of datatype string and the system will open the database, search for the searchkey, and return true or false depending on whether or not the searchkey was found, and close the database.Īll users will be able to input some data, the system will open the database, store the data, return true or false depending on whether or not the data was stored, and close the database. The system will validate the user name and password and will reject them if either they are missing or if the user name is already taken.Īny users can login only if they have already registered. Thanks in advance.Īny users can create an account by registering.

I feel like I have left out some classes or something because I just can't seem to find the relationships from my understanding of relationships.Īny assistance will be really appreciated. a credit card and its PIN - the PIN class can also be used in a debit card class) and a composition relationship is a special form of aggregation that allows each part to belong to only one whole at a time.

I'm new to design patterns and UML class diagrams but from my understanding, the association relationship relates one object with another object the aggregation relationship is a special kind of association that allows 'a part' to belong to more than one 'whole' (e.g. I am trying to create this class diagram so I can use it to create a simple online PHP application that allows the user to register an account, login and logout, and store, search and retrieve data from a MySQL database.Īre my classes correct? Or should I create more classes? And if so, what classes are missing? What relationships should I use when connecting the register, login, logout, search_database and add_to_database to the users? I would like your guidance on how to create classes and their relationships (generalization, association, aggregation and composition) accurately from my USE case diagram (please see below).

Create use case diagram