"Even the coolest feature or the most compelling content is useless if people can’t find it." - Jakob Nielsen
When you’re designing a website, nothing happens in a vacuum. Every facet of design – research, IA, interaction design, visual design, content strategy - tends to affect everything else.
So it’s important to know where Information Architecture (in general) and tree testing (in particular) fit into the design process.
Next: Chapter 4 - Planning a tree test