Evaluation Topics: Human-System Control
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Intention of Use: What does the designer want the user to choose from and for which purpose?
- In human control (selection, manipulation and travel) tasks, the user typically specifies not only what should be done, but also how it should be done, more or less directly controlling the action. - In system control tasks, the user typically specifies only what should be done and leaves it up to the system to determine the details. The system control is considered to ben an explicit action in stead of an implicit action.
1. Users and User Tasks
navigation
locomotion
selection
manipulation
user tasks
2. User Interface Input Mechanisms
tracking user location & orientation
speech recognition & natural language input
interface mechanisms in general
pointers&clicks&props, like magic wands, flying mice, space balls, real-world props.
data gloves & gestural recognition
3. Virtual Model
system information
user representation & presentation
agent representation & behaviour
virtual surrounding & selling
4. User Interface Presentation Components
visual feedback & graphical presentation
haptic feedback & force and tactile presentation
aural feedback & acoustic presentation
environmental feedback and other presentation.
According to the extended placement options by Bowman et al. menus can be placed in the following ways:
world-referenced (most desktop VR menus).
object-referenced (e.g. combo box in).
head-referenced (e.g. look-at-menu).
body-referenced (e.g. TULIP).
device-referenced (e.g. tool menu of the responsive workbench.
PIP tool-palette.
fade-up menu.
System Control can be defined as the user task in which commands are issued to:
(1) request the system to perform a particular function
(2) change the mode of interaction
(3) change the system state.
