The fourth step is to attribute a w

The fourth step is to attribute a weight to each
criteria, distributing the value 10 among the 5 criteria adopted. An “equilibrate” weight distribution is obtained by multiplying each value by 2. This corresponds to giving a 20% relevance to each criteria in the choice of the best coagulant and dose. Obviously, the same result could be obtained by dividing the value 100 among the 5 adopted criteria. In this case, an “equilibrate” weight distribution should be obtained by multiplying each value by 20. In general, if there is no interest in giving a different weight to the several criteria, the normalized value can be directly considered as it is.