“These UX design practice verticals were the product of an IA exercise that charted the primary activities of eight unique forms of practice that play out in any comprehensive UX design project-large or small. Information architecture is one of those practices. It’s possible to arrange the following six tiers of the IA practice vertical-which together make up the primary areas of interest of information architecture-in a way that permits the quick evaluation of a site’s IA maturity.”

(Nathaniel Davis a.k.a. @iatheory ~ UXmatters)