The User Interface design

Design the user interface
1. Identifying and classifying the inputs and outputs
In the event tables, triggers represent the inputs, and outputs are shown as responses to events.
Traditional approach: data flow diagrams.
2. System interface VS System interface
System interface: I/O, require little human interaction
User interface: require human interaction to the user, and sometimes UI is the system.
Physical aspect, perceptual aspect, conceptual aspect.
3. Human-computer interaction (HCI)
Metaphors for HCI:
a). Direct manipulation metaphor: user interfaces with objects on display screen.
b). Document metaphor: computer is involved with browsing and entering data on electronic documents
c) Dialog metaphor: much lick carrying a conversation
Guidelines for designing UI:
Visibility: all controls should be visible, and provide immediate feedback to indicate control is responding.
Affordance: appearance of control should suggest its functionality, the purpose for which it is used.
4. Documenting dialog design: used to design menu hierarchy (allow user to navigate to each dialog provides overall system structure)
Using UML dialogs:
a)Use case description: list of steps followed as system and user interact
b) Activity diagrams: document dialog between user and computer for a use case
c)System sequence diagrams
5. User centered design:
a) Focusing early on users and their work
b) Evaluating designs to ensure usability
c) Applying interactive development