This volume offers 11 papers that cover the wide spectrum of influences on Rudolf Carnap's seminal work, Der Logische Aufbau der Welt (The Logical Structure of the World). Along the way, it covers a host of topics related to this important philosophical work, including logic, theories of order, science, hermeneutics, and mathematics in the Aufbau, as the work is commonly termed. The book uncovers the influences of such neglected figures as Gerhards, Driesch, Ziehen, and Ostwald. It also presents new evidence on influences of well-known figures in philosophy, including Husserl, Rickert, Schlick, and Neurath. In addition, the book offers comparisons of the Aufbau with the work of contemporary scientists such as Weyl and Wiener as well as features new archival findings on the early Carnap.This book will appeal to researchers and students with an interest in the history and philosophy of science, history of analytic philosophy, the philosophy of the Vienna Circle, and the philosophy in interwar Germany and Austria.