... Chen¹

MIS Department, College of Business and Public Administration, University of Arizona, Tucson, Arizona 85721, hchen@bpa.arizona.edu, (602) 621-4153.

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... BRS/SEARCH²

Vended by BRS Software Products, McLean, Virginia, USA.

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... BASIS/Plus³

Vended by Information Dimensions Inc., Dublin, Ohio, USA.

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... PixTex⁴

Vended by Excalibur Technologies Corp., McLean, Virginia, USA.

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... Topic⁵

Vended by Verity, Inc., Mountain View, California, USA.

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