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==2. Heuristic Method==

Heuristic method simplifies and eliminates some aspects of the exact method with the user’s experience and point of view. The options are narrowed. Rule of thumb is an example to heuristic approach. Heuristic method can provide substantially faster calculations in comparison to the exact method. As a result of the speed gain, heuristic approach can be a more convenient method for large scale problems. But heuristic method doesn’t guarantee an optimal solution, it may still fail to deliver solution for complex optimization problems [2].