Who's Keeping Score? The Value of Usability Scorecards and Metrics
http://events.powerstream.net/002/00143/20071115ScoreCards/

Goddard, Phil and Susan Weinschenk
Human Factors International
2007

Abstract:

Explains how HFI's evolving set of user experience metrics can help you: quantify best practices in design at a site, sub-site or page level; prioritize your usability resources across a range of projects; get valuable feedback quickly, in 'design time'; track and benchmark user experience over time; learn how you score against your competitors; and synthesize your various user data streams into an integrated UX dashboard.