For example, if the downdraft gasifier
only can treat the tenth of generated waste and the
plasma gasifier can treat all waste generated, clearly,
the plasma is critically better and the weight will be 8.
In other case, if the social criterion was weakly better
than the environmental criterion, the corresponding
weight was 3. This procedure was used for all pairwise
comparison. Table 2 shows the verbal-numerical scale
that was used for the weighting.