Human beings have employed the notion of systems so widely in all kinds of scientific studies. Systems modeling or system modeling is an artifact created by humans to define what a system is. A system has been defined, by systems modeling 1.0, hopefully to be an integrated whole, embodied in its assembled components, their interrelationships with each other and the environment. This systems modeling 1.0 defining a system possesses one cardinal deficiency. The deficiency comes from that it does not define the integration of systems structure and systems behavior.Systems structure and systems behavior are the two most significant views of a system. In order to achieve a truly integrated whole of a system, we first need to integrate the systems structure and systems behavior together. In other words, integration of systems structure and systems behavior results in the integration of a whole system. Since systems modeling 1.0 does not define the integration of systems structure and systems behavior, very likely it only hopes and will never be able to really form an integrated whole of a system. In this situation, systems modeling 1.0 is powerless in defining a system appropriately.Structure-behavior coalescence (SBC) provides an elegant way to integrate the systems structure and systems behavior of a system. A system is therefore redefined, by systems modeling 2.0, truly to be an integrated whole, through structure-behavior coalescence, embodied in its assembled components, their interactions with each other and the environment. Systems modeling or system modeling 2.0 uses the SBC architecture description language (SBC-ADL) to formally define the essence of a system and its details at the same time. SBC-ADL contains six fundamental diagrams: a) architecture hierarchy diagram, b) framework diagram, c) component operation diagram, d) component connection diagram, e) structure-behavior coalescence diagram, and f) interaction flow diagram. Since systems modeling 2.0 demands the integration of systems structure and systems behavior, definitely it is able to form an integrated whole of a system. In this situation, systems modeling 2.0 is fully capable of defining a system.In this book, we shall dwell on systems modeling 2.0 through the application of SBC-ADL. By this book's introduction and elaboration of SBC-ADL, all readers will understand clearly how systems modeling 2.0 helps us define a truly integrated whole of a system.