Evaluation Topics: Human-System Control

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.

Human Control: taxonomy or usability characteristics

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