Competitive Analysis

Data on what works well or poorly on other sites saves you from implementing useless features and guides UX investments to features that your users need.

Competitive Usability Evaluations: Learning from Your Competition
Nielsen Norman Group
Competitive Analysis: Understanding the Market Context
Boxes and Arrows
Competitive Analysis Example - Adventures in UX
Amelia Bauerly
Competitive Analysis
How to Conduct and Prepare a Competitive Analysis
Edward Lowe Foundation