Understanding factors (dimensions) that affect your eCommerce success.
eCommerce trust, performance, content, and navigation perceptions all combine to create satisfaction, which leads to loyalty and referrals. According to Webreep (2012). If you work on each dimension over time, you can drastically improve your eCommerce success.
Ease of Use and Ease of Search contribute to navigation. A classic book which addresses these facets is called "Don't make me think" by Steve Krug. Mostly this book focuses on navigation.