Model-Based Systems Engineering (MBSE) gained momentum within the last years and is regarded as the key to face the challenges of product engineering. Nevertheless, numerous barriers exist that inhibit the implementation of MBSE in industrial application. One is about what constitutes MBSEup to now there is no single view on this topic. This is due to the numerous disciplines involved in the enhancements of MBSEonly recently there had been efforts to create new MBSE approaches and even languages. We state that similar to classical Systems Engineering there will not be one specific MBSEcurrent trends in product engineering as well as literature support this thesis. By the help of a consistency analysis evaluating relevant features of MBSE as degree of language formalization and tool support consistent combinations of these features are clustered. As a result possible MBSE concepts are suggested. These concepts enable a better understanding of the different objectives of this interdisciplinary approach. The existence of the concepts is shown based on known pilot projects.