If he now interviews a new set of couples, does his predictions according to the developed model, and it _still_ gives high accuracy, then we can call it scienc

If he now interviews a new set of couples, does his predictions according to the developed model, and it _still_ gives high accuracy, then we can call it science. The power of a good model lies not in how good it predicts what you know, but how it can be used to model unknown/new phenomena.