Wilson Web, social sciences and humanities

Research Cooperative
29/05/10 11:31:06PM
The H. W. Wilson company has developed WilsonWeb, an
Internet-based information retrieval system designed for library
patrons and staff. Access is through an institutional subscription. The company is particularly strong in art history and social sciences, but also covers many applied sciences well.

The WilsonWeb distinguishes between 'humanities' and 'social sciences', but I cannot see what criteria are used to separate these categories.