1. A system for determining a quantitative measure of qualitative usability of related Web pages, comprising: stored Web pages that each include at least one hyperlink referencing and proximal cues relating to distal content included in another Web page; a stored information goal identifying a target Web page; an activation network, comprising a directed graph comprising nodes corresponding to the Web pages and arcs corresponding to the hyperlinks, wherein a weight is assigned to each arc to represent a probability of traversal of the corresponding hyperlink based on a relatedness of keywords in the information goal to the proximal cues included in the referenced Web page; and a simulator to evaluate a traversal through the activation network to the node corresponding to the target Web page as a quantitative measure of usability.