  Emission lines of Be-like ions are frequently observed in astrophysical
plasmas, and many are useful for density and temperature diagnostics. However,
accurate atomic data for energy levels, radiative rates (A-values) and
effective electron excitation collision strengths ($\Upsilon$) are required for
reliable plasma modelling. In general it is reasonably straightforward to
calculate energy levels and A- values to a high level of accuracy. By contrast,
considerable effort is required to calculate $\Upsilon$, and hence it is not
always possible to assess the accuracy of available data. Recently, two
independent calculations (adopting the $R$-matrix method) but with different
approaches (DARC and ICFT) have appeared for a range of Be-like ions.
Therefore, in this work we compare the two sets of $\Upsilon$, highlight the
large discrepancies for a significant number of transitions and suggest
possible reasons for these.
