The Public Libraries in Aarhus (Denmark) and Chicago (USA), with funding from the Gates Foundation, created the Design Thinking for Libraries toolkit to introduce a way of working that will help you understand the needs of your patrons and engage your communities like never before. We understand that the challenges facing librarians are real, complex and varied. As such, they require new perspectives, new tools and new approaches. Design Thinking allows us to work together to discover what our communities want and experiment to create services, programs and processes to meet their changing needs. This toolkit serves as an introduction.