(iii)specification of numerical values using pair-wise comparison scales (Table 1, [14]); (iv) calculation of normalized principal eigen vectors, maximum eigen value,consistency index, consistency ratio and random consistency index
(Table 2 [17,19]) for each criteria; (v) if inconsistencies in the decision process exist, revise the process till a consensus is reached;and (vi) integration of weight values to reach an optimum decision.