When organizing content and actions on mobile, solid information architecture principles like clear labeling, balanced breadth and depth, and appropriate mental models remain important. But the organization of mobile web experiences must also align with how people use their mobile devices and why; emphasize content over navigation; provide relevant options for exploration and pivoting; maintain clarity and focus; and align with mobile behaviors. In this exclusive excerpt from his new book, Mobile First!, Luke Wroblewski explains how to do all that.