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The Decision Analyst or DA has to look at the problem from all angles rather than from his own point of view. This goes a long way in proper problem modeling and solution, satisfying the need of all stakeholders. Application of this principle becomes very useful in Complex Project management, Conflict resolution, Negotiation and Counseling among other such problems...
MCDM in real life problem solving is important as in many situations of real life problems, you would have to evaluate many criteria for making a decision.
Exhaustive approach: MECE principle in Real life problem solving means, you need to be 100% thorough in considering possibilities that also do not overlap.
Instead of solving just by instinct and common sense, adopt a systematic analytical approach to solving a real life problem that is uncertain and vague.
Can anyone become a problem solver solving any problem independently? To us the answer is an emphatic yes. Surely you also can solve any problem yourself.