In general, a systems engineering methodology is possible to differ from an older design method by showing better generality in its simple logical outline and bigger concern with the essential objectives to be achieved by the organizations. Thus, at each stage, the systems engineer is likely to ask both how and why, rather than only how.
The precise role and accountability of the systems engineer may change from task to task based on the scope and complexity of the assignment with different phases of the life cycle. For big projects, there may be more than one systems engineers. For small projects, occasionally the project manager may do the required responsibilities. However, the systems engineering functions should be completed as outlined by the businesses. The real task of the roles and responsibilities of the identified systems engineer may vary from project to project.
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