  Finding a rationale behind the observed pattern of neutrino mixings has been
at the focus of neutrino flavor model building. Many different approaches have
been put forward including models based on symmetries. Among the most
predictive models based on symmetries are models which predict not only the
mixing parameters but also correlations between them. These mixing sum rules
allow to probe flavor models in the future. In this white paper we collect the
predictions for the mixing parameters from flavor models based on discrete
symmetries broken to certain residual symmetries of the lepton mass matrices
and from models with modular symmetries to contrast them with bounds from
current and future oscillations experiments.
