  We present a self-consistency analysis of fission product yield evaluations.
Anomalous yields are determined using a series of simple conservation checks
and comparing charge distributions with common parameterizations. The total
prompt neutron multiplicity as a function of product mass $\bar{\nu}_T(A)$ is
derived directly from the independent fission product yields using average
charge conservation. This method is checked against Monte Carlo simulations of
the de-excitation of the fission fragments in a Hauser-Feshbach statistical
decay framework. The derived $\bar{\nu}_T(A)$ is compared with experimental
data, when available, and used to compare the prompt neutron multiplicity
$\bar{\nu}$ for the various evaluations. Differences in $\bar{\nu}$ for each
evaluation are investigated and possible sources are identified. We also
identify fission reactions that are inconsistent with prompt neutron data and
propose possible solutions to remedy the observed inconsistencies.
