The contributions to this volume address important issues about books and their users in the 15th century. A unifying theme is the complex relationships between producers - be they authors, printers or decorators - the economic conditions of book distribution, and the requirements of readers or other users of books. Two contributions focus on technical aspects of the production of books, essential for our understanding of how texts met their readers. Such engaged and informed openness towards other disciplines is necessary for students of books to understand why the European invention of printing was successful - of why books became the first successful mechanically mass-produced marketable product.