  We propose a procedure to cross-validate Monte Carlo implementations of the
standard model effective field theory. It is based on the numerical comparison
of squared amplitudes computed at specific phase-space and parameter points in
pairs of implementations. Interactions are fully linearised in the effective
field theory expansion. The squares of linear effective field theory amplitudes
and their interference with standard-model contributions are compared
separately. Such pairwise comparisons are primarily performed at tree level and
a possible extension to the one-loop level is also briefly considered. We list
the current standard model effective field theory implementations and the
comparisons performed to date.
