  We discuss the implications of dimension-six operators of the Effective Field
Theory (EFT) framework in the study of Vector Boson Scattering (VBS) in the $pp
\to Z Z j j $ channel. We show that operators of dimension-six should not be
neglected in favour of those of dimension-eight. We observe that this process
is very sensitive to some of the operators commonly fit using LEP and Higgs
data, and that it can be used to improve the bounds on the former. Further we
show that other operators than the ones generating anomalous triple and quartic
gauge couplings (aTGCs/aQCGs) can have a non-negligible impact on the total and
differential rates and their shapes. For this reason, a correct interpretation
of the experimental results can only be achieved by including all the relevant,
bosonic and fermionic operators; we finally discuss how such an interpretation
of experimental measurements can be done.
