  Series of short baseline neutrino oscillation experiments provided unexpected
results, and now they are called short baseline anomalies, and all indicates an
existence of sterile neutrinos with a mass scale around 1~eV. The signals of
short baseline anomalies are reported from 4 different classes of experiments.
However, at this moment, there is no convincing theoretical model to explain
such sterile neutrinos, and a single experiment to confirm 1~eV sterile
neutrinos may be challenging. In this short note, we describe classes of short
baseline neutrino oscillation experiments and their goals.
