The textbook by Armin Heinzl, Alexander Maedche, and René Riedl introduces to the information systems discipline systematically and fundamentally. It describes the subject area of information systems, the scientific foundations, the role of theory and technology as well scientific methods used in the field of information systems. It introduces a classification of information systems, information infrastructures as well as the importance role of the human in information systems.  Furthermore, fundamental concepts such as information and communication, digitalization and digital transformation are introduced. The book is aimed at students and teachers in undergraduate bachelor's and master's programs. Scholars and practitioners can also gain new insights from reading the text book.The book is available here: https://link.springer.com/book/10.1007/978-3-662-67392-8