Richards J. R. and M. J. Egenhofer. "A Comparison of Two Direct-Manipulation GIS User Interfaces For Map Overlay" in Geographical Systems, Vol. 2, No. 4, 267-290, 1995.

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Usability of Textual and Visual Query Representations for.. - Traynor, Williams (2000)   (Correct)

....answers, attempted more exercises, and got a higher percentage of attempted exercises correct in the visual condition than in the textual, and also gave higher subjective ratings to the visual condition. The generalizability of the results to other researchers proposed visual interfaces for GIS [1, 2, 4, 5] is unclear, because they use very different metaphors from C SPRL s comic strip metaphor. However, we conclude that visual query representations show promise for having usability advantages for non specialist users. ....

Richards J. R. and M. J. Egenhofer. "A Comparison of Two Direct-Manipulation GIS User Interfaces For Map Overlay" in Geographical Systems, Vol. 2, No. 4, 267-290, 1995.

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