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Unfortunately, this task is often neglected. The human urge to
concentrate on one single solution to a problem blurs the sight on the fact that an
alternative solution may be better suited.
This means that, based on the requirement model, a systems engineer does
not only develop a system design, but normally additional alternative designs.
This allows the systems engineer to weigh several solutions against one another.
It will hardly ever happen that all benefi ts are united in one single solution. This
means that different criteria and priorities have to be considered. Typical aspects
include, e.g., cost, size, weight, development time, time-to-market, and risks. Simulation
parameters are derived from the system models to make the required
aspects directly visible, comparable, and measurable in the model. SysML supports
this work, e.g., by the parametric diagram (Section 4.6).
Model system
Design models are created as early as when we weigh alternative solutions. This
step is the detailing of the selected solution ??™ s model.


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