The document discusses more effective approaches to designing and prototyping user interfaces. It advocates sketching early ideas, prototyping functionality quickly through coding, and testing prototypes with users from the start. Specific techniques recommended include sketching user flows, building clickable prototypes in HTML/CSS/JS, using storyboarding apps, and designing interfaces directly in the browser using the right tools for each task. Examples from Google Glass and Incantor show how quickly prototyping uncovered important insights not evident from traditional planning methods. The key takeaways are to sketch often, start prototyping instead of wireframing, test early and frequently, avoid unnecessary comps, streamline workflows, and allow for non-linear processes.