MBSE

Methodology that focuses on creating domain models as the primary means of information exchange between engineers, rather than on document-based information exchange.

The formalized application of modeling to support system requirements, design, analysis, verification and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases. (INCOSE 2007)

Snippet from Wikipedia: Model-based systems engineering

Model-based systems engineering (MBSE) is a systems engineering methodology that focuses on creating and exploiting domain models as the primary means of information exchange between engineers, rather than on document-based information exchange.