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INTERACTIVE SYSTEM DESIGN & EVALUATION
Types of HCI (Human Computer…
INTERACTIVE SYSTEM DESIGN & EVALUATION
- Types of HCI (Human Computer Interaction)
CONCEPTUAL MODELS
- INTERACTION TYPE
What the user is doing when interacting witht he system, e.g. instructing, talking, browsing or other
- WHICH INTERACTION TYPE TO CHOOSE
- Need to determine requirements and user needs
- Take budget and other constraints into account
- Also will depend on suitability of technology for activity being supported
- INTERFACE TYPE
The kind of interface used to support the mode, e.g. speech, menu-based, gesture
HUMAN-COMPUTER DIALOGUES
- What the user sees is their inputs and the systems outputs. These constitute a dialogue between human and machine.
- Dialogues are sequence of inputs and outputs designed to support the users in performing tasks
- What information does the computer need from the human? In what order?
- What information does the human need from the computer? In what order?
- What graphic displays of data enable the humans to see the information they need?
- What sequences of actions should the computer enable or disallow?
TYPES OF MESSAGE IN DIALOGUES
2 TYPES OF DIALOGUE
- Message passing: The user exchanges messages with the computer (Unix and DOS command line interfaces)
- Direct manipulation: The user directly manipulates object represented in the computer (Windows & Mac GUIs)
INTERACTION TYPES
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WHICH MODEL IS BEST
- Direct manipulation is good for 'doing' types of tasks, e.g. designing, drawing, flying, driving, sizing windows
- Issuing instructions is good for repetitive taks, e.g. spell checking file management
- Having a conversation is good for children, computer-phobic, disabled user and specialized applications (e.g. phone services)
- Hybrid conceptual models are often employed, where different ways of carrying out the same actions is supported at the interface - but can take longer to learn
HOW DO WE UNDERSTAND HOW TO USE IS?
- known pre-planned association of actions with system responses
- Much easier if we can predict what the system will do
MENTAL MODELS OF HCI
- When we use and control an interactive system, we exchange informattion with ti
- Different ways to think about the interaction
- when we use the system
- when we design it
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GOALS, ACTIONS, SYSTEM RESPONSES 
- EVALUATION BRIDGE
- Interface display (provides i/p)
- Interpretation in to commands
- Evaluate (calculated response based on analysis of commands)
- EXECUTION BRIDGE:
- Intentions (what needs to done)
- Actions are commands/calculations performed at a certain point in time
- Interface mechanism reciev commands to trigger other activities
3 WAY INTERACTION:
- Himan, computer, environment
- What does it feel like to interact with computer and real word at same time?
- What does it feel like we're doing?
- What are we really doing?
- This will depend on what the apps let us do, and how e.g.
- Manipulating computational entities in real space? Pokemon Go
- Moving through computationally defiened geography in real space?
- Instructing features of real spcace to change themselves?