The challenges of a market affected by an economic climate in stagnation, if not exactly in a real recession crisis like the one today, require systems construction times extremely short even with innovative and complex products. In addition, engineering teams can only rely on limited budgets to ensuring the right level of quality of manufactured product. The Systems Engineering discipline should not be considered as a mere technical activity in the systems development life-cycle, rather as an

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... pproach capable to determine the economic-industrial sustainability of the entire project; today, innovators leverage Model-Based Systems Engineering for addressing these challenges. This article describes the Best Practices for the implementation of the Model Based Systems Engineering as a result of the experience and its application in the complex system's design. These Best Practices, using UML/SysML as an independent modeling language paradigm, support analysis, design, development, verification, and validation phases through the implementation of executable models. However SysML modeling alone doesn't represent a definitive solution. SysML is commonly perceived as a complex language by Systems Engineering communities, with many semantic elements which if used all together can lead to an entropic effect of not manageable relations, instead of providing an effective synthesis. The key for a correct adoption of MBSE paradigm is the definition of a reference workflow that will serve as a guideline through a set of essential language elements. It allows Systems Engineers to focus on the definition of specifications and architecture to be delivered to engineering specialists for hardware, software and testing. This article describes an example of a workflow for requirements analysis, functional analysis and design phases including main activities to be performed, artifacts to be produced and Best Practices supported. Collaborative aspects of Systems Engineering life cycle emerging from requirements and change management process areas are addressed too.