A questionnaire! Such an obvious solution. A purpose-built, scientifically valid instrument incorporating current best practice to filter out the time wasters, the disorganized, the ice-cream discriminators, the visual-harassment complainers, the crystal gazers, the horoscope readers, the fashion obsessives, the religious fanatics, the vegans, the sports watchers, the creationists, the smokers, the scientifically illiterate, the homeopaths, leaving, ideally, the perfect partner or, realistically, a manageable short list of candidates.
