Connie's Convenience Store - About Peter Coad

Selecting Human-Interaction objects Connie’s Convenience Store 67
Consider these strategies for selecting windows.
#27. “Select Windows: A First Cut” Strategy selecting objects (model components)
• Add windows for each problem-domain object that you are working with.
• If an object has line items, model both with a single window.
#28. “Select Logon Window” Strategy selecting objects (model components)
• Add a logon window—if the system needs to know who is using the system, for access
control and accountability.
• Examples: cashier logon window, customer logon window, order clerk logon window—or
simply a logon window.
#29. “Select Setup Windows” Strategy selecting objects (model components)
• Add system setup windows.
Create and initialize the objects you need, to get the system ready to go.
Add system administration services for adding users and privileges.
• Add activate and deactivate actions.
Do this for whatever human interaction might be needed for activating or deactivating
an interacting system or device.
Put the actions with a window that knows objects that can carry those actions out.
• Note: Don’t include data entry “nuts and bolts,” such as screen, monitor keyboard,
mouse, mag-stripe reader, and the like.
#30. “Select Core Windows” Strategy selecting objects (model components)
• Consider who (audience) needs what (content), and why (purpose).
• Add “conducting business” windows.
Include transaction windows. Examples: sale window, session window, payment
window.
• Add “analyzing business results” windows.
• Consider combination windows, when content is closely related in time.
Examples: a transaction and its line items; a sale and payment window.