Last fall, at the Pratt Institute School of Information and Library Science in New York, Barbara Genco, collection development director at the Brooklyn Public Library, taught a course on collection development principles, theory, and practice. "Library Journal" asked her to distill her curriculum down to 20 talking points that address the future of collection development and the working world awaiting this generation of library school graduates. This article presents Genco's 20 maxims for collection building and contemporary collection development, as told to Raya Kuzyk, a regular "Library Journal" contributor.