The document discusses usability-oriented web analytics, with the goals of continuously improving a website's usability from the user's perspective. It presents an approach of identifying successful and unsuccessful user transactions and behaviors in order to measure user performance and detect fluctuations. The findings can then be analyzed to identify causes and build a knowledge base of good and bad solutions to support usability engineering tools. The current status is a prototype system that aims to advance from measuring transactions to full user tasks and experiences.