The effects of graphical interface design characteristics on human-computer interaction task efficiency

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The main objective of this paper was to investigate the effects of a computer screen interface design and its related geometrical characteristics of 36 graphical objects on a user's task efficiency.

• A total of 490 subjects took part in laboratory experiments that focused on the direct manipulation of a visual dialogue between a user and a computer.
• The subjects were asked to select an object from among a group of items randomly placed on the computer screen that were visible exclusively during the visual search process.
• A model expressing the mean object acquisition time as a function of graphical object size and the configuration was developed and statistically validated.