Book excerpt: The drawings of Raphael and his circle offer a unique view into the creative processes of this renowned artist. Sixty-eight of his most discussed and controversial studies of form, movement and detail from the collection at the Royal Library, Windsor Castle, are examined here by a leading scholar. Works by Raphael's masters such as Perugino, and his pupils including Giulio Romano, Perino del Vaga and Polidoro da Caravaggio are considered together -- examining the development of workshop methods, style and techniques -- and as individual works of art.