Metrics Analysis.

Web metrics are a treasure trove of UX data and insights. Used properly, metrics are the ultimate behavioral analysis tool; the trick is to know how to read the data and what it means.

How to choose the right UX metrics for your productGoogle VenturesDecember 2nd, 2015
How to Choose the Right UX Metrics for Your Product (presentation)Digital TelepathyDecember 2nd, 2015
How Metrics Can Make You A Better DesignerSmashing MagazineSeptember 20th, 2011
Beyond Goals: Site Search Analytics from the Bottom UpA List ApartSeptember 22nd, 2009