This book is the outcome of the 2017 edition of the Verbier Art Summit last January, organized in cooperation with museum director Beatrix Ruf and her curatorial team at the Stedelijk Museum Amsterdam. By sharing the content of the Summit through this publication the global dialogue continues on "SIZE MATTERS". The theme of the Verbier Art Summit and this accompanying publication, has been chosen by museum director Beatrix Ruf. It is based on her personal experiences with the transformations of these institutes and their corresponding increase in scale, but also about issues that every museum is faced with, struggles with, reflects on how to address, and considers in a self-critical way. [publisher's note]