The inherent limitation of the heuristic models is their being heuristic in nature. These models base the analysis on a certain set of simplified rules and assumptions, and are put to use only to avoid the complexity associated with the real detailed models.
Hence we have to compromise on the precision of the solution in terms of its optimality and settle for a near-optimal solution, which might even be the optimal solution in certain cases.
There has been a revival of interest in integer linear programming formulations of the multi-resource constrained project scheduling problem as more efficient computer codes for solving such problems are being developed. Still, relatively small (generally upto 15 activities and 3 resource types) can be handled by this approach.
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