We designed 2D-extended, 3D-survey, and 3D-route interfaces and set up three tasks to test the operational performance of the children. We utilized the usability test for human computer interfaces developed by Nielsen (2000), and then combined that score with the space navigation and relative way-finding parameters used byWesterman et al.
(2005) and Lynch and Horton (2009). Efficiency wasmeasured by examining the duration of time spent on a task.
Precision was measured by counting the number of times the button (Found), category buttons and page buttons were clicked for comparison between tasks and databases in the process of information retrieval. Effectiveness was measured as follows: