Use Case Concepts in Object-Oriented Analysis
Completion requirements
The use case is the first key OO modeling diagram discussed for application in the requirements phase of the SDLC. Use cases are a powerful way of modeling what the system needs to do. "Actors" are key in capturing requirements; the following section elaborates on their use in requirements analysis.
Identified Actors and Their Related Use Cases for the POST system
Applying the techniques used to identify use cases, we can have a sample list (not an exhaustive) of relevant actors and use cases as shown in Table 3.9
Table 3.9: Actors and Use Cases for POST System
| Actor | Use Case |
| Cashier | Log In / Logout Cash Out |
| Customer | Buy Items: uses • By cash Refund Items• By credit |
| Manager | Start Up Shut Down |
| System Administrator | Add New Users |