It is necessary to deal with
    unknowns,
    uncertainties,
    complexities,
    adaptive actions,
    risk managements,
    crisis managements 
    and so on
 
to converge into a set of solutions, drivers of which are strengthened by syntactics of established/promising logical patterns, semantics of observed objects and pragmatics about producers and users.
 
    - Physical feasibility can be reached when an expert group shares a intersubjective understanding of relatively stable nodes from which everyone can reproduce the same results.
- Engineering feasibility can be verified by an existence of human products. 
- Economical feasibility is realized as a sustainable status maintained by producers, customers and other stakeholders.
- Social ...
- Political ...
- Cultural ...