This document discusses responsive web design from the perspective of the University of Pittsburgh Libraries' transition to a responsive site. It provides background on the old site and reasons for going responsive. Key aspects covered include taking a mobile-first approach, focusing on content strategy and rewriting content for mobile, optimizing images, using responsive images and grids, and employing an agile process. Tools mentioned that were useful include frameworks like Skeleton, Foundation and Bootstrap. Lessons learned emphasized spending time on content and design before coding, continuing to optimize linked sites, and testing across devices.