UML – Unified Modeling Language

Use-Case Diagrams

What is UML?

UML unified modeling language Mainly used for development of OO Used in conjunction with UP

Unified process

What is UP?

Inception Elaboration Construction Transition Production

What is a use-case diagram?

Depicts the software or system from the end user’s point of view

Steps Define the actors Define the goals Determine who is primary and secondary

actors

Use-case (cont)

Basic use-case presents a high-level story that describes the interaction between the actor and the system

Use-Case Scenarios

Use-case template

Use-case Primary actor Goal in context Pre-conditions Trigger Scenario Exceptions Priority When available Frequency of use Channel to actor Secondary actors Channels to secondary actors Open issues

Users use-case example

Use-case: UsersUseColiseumManagementSystem Primary actor(s):Coliseum Administration Staff, Web-users, Coaches,

Students Goal in context: To provide users the correct interfaces so that they

may use the system Pre-conditions: Users are not logged in and users are in the database Trigger: User decides to use the system Scenario: 1) users observe the interface; 2) the user enteres

usrn/pwd 3) the user selects submit 4) observes system to indicate he/she is logged in

Exceptions: 1) user is already logged in; user would just use the system 2) usrn/pwd pair is not recognized and user would try to login again; if user cannot login then it is reported to the helpdesk for a pwd reset 3) usrn/pwd pair is not in the system; Helpdesk would add user to the system 4) user is logged in the next interface is shown 5)user would make selection from possible dashboard options

Use-case example (cont)

Priority: essential, must be implemented When available: first increment Frequency of use: many times per day Channel to actor: intranet/internet interface through web

browser Secondary actors: Helpdesk Channels to secondary actors: Helpdesk telephone, live

web chat and email Open issues: 1) should there be a way to log into the system

without usrn/pwd 2) should there be any other messages given to the user 3) how many attempts does the user get to login 4) is there a way to logout 5) do all users have to login

Use-case diagramColiseum Management System

Administration

Coaches

Web-users

Students

Helpdesk

Login

View Dashboard

Chat with Helpdesk

request account

Requirements Definitions

Requirements Definitions

Purpose Target Audience Template