As to purely tactical issues, one aspect which is evident from
the tables, is that the literature integrating an important aspect
like uncertainty in tactical decisions is still scarce. In fact, very few
papers address the use of stochastic parameters such as waste
generation, or travel times. In addition to these findings, we note
that the a great part of tactical models related to SWM is mostly
oriented at minimizing costs. Of course, this makes sense, because
SWM decisions usually involve large monetary sums. However, the
socio-political aspects related to SWM are important issues that
should be taken into account more carefully, given the growing
public concern for environmental preservation, as also pointed out
in Section 1.