Modeling of software systems often focus mainly on the operational system during its operational stage, with less attention to various other life-cycle stages and other contexts of operation, such as testing, training, maintenance, and others. Introducing new model-oriented definitions for the terms "architecture" and "configuration" this work proposes an approach to model system/software architecture and all its associated configurations under one set of interrelated models. The approach is applicable both to structural and behavioral architectures, at all levels of software/system decomposition. The concepts of the approach are demonstrated through a case study, using the UML modeling language.