The Organization (organization name removed for double-blind review process) has been developing an MBSE Methodology to address the increased digitalization of systems engineering and facilitate the complex system development in European space projects. The methodology is based on the European Cooperation for Space Standardization (ECSS) standards for Systems Engineering, and feedback from projects using the methodology. By using the ECSS standards as the starting point, the processes, terminology and expected outputs are familiar to the engineers, lowering the usage barrier within the Organization. This paper describes the background of and effort for establishing the MBSE methodology and a description of the methodology. The paper also reports on the current efforts at the Organization for deploying MBSE and the way forward regarding the methodology.