2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/187047We compare the effectiveness of various tests of three-flavor mixing in future long-baseline neutrino oscillation experiments. We analyze a representative case of mixing in a simplified three-flavor scheme, whose relevant parameters are one neutrino mass-square difference, $m^2$, and two mixing angles, $ψ$ and $ϕ$. We show that an unambiguous determination of $ψ$ and $ϕ$ requires flavor-appearance tests in accelerator experiments, as well as supplementary information from reactor experiments.4 pages, RevTeX, including 4 figures. Requires epsfig.sty. Submitted to Phys.Rev.DHigh Energy Physics - Phenomenologytext