This work is for students and Husserl scholars interested in the genesis of Husserl's thought, and more specifically in the question of intersubjectivity. Based on both published and unpublished materials, it offers a long hand study on the origins of the problem of intersubjectivity. Disentangling the complicated relations between ideality and alterity the book sheds an original light on some of the major themes of Husserl's philosophy and argues, in concluding, for the elaboration of a "first phenomenology". Clear and to the point, the book is especially valuable for students in search of a handy introduction to the beginnings of phenomenology.