Architecture Fundamentals^TM is a forthcoming reference publication, concisely summarizing the primary conceptual IT architecture topics and their essential aspects. The target audience are IT and especially Software Architects. Throughout the publication, all IT architecture aspect are presented with the same structure: a conductive statement, an underlying rationale and companion representative example. The entire content is based on over six years of experience in the field of IT Architect education and training by Ralf S. Engelschall, computer scientist and principal IT architect — plus many feedback and support by his colleagues and friends.