The most important question one should ask is if this study provides enough findings to base a theory on it. Can one base a theory on a measurement that highlights several minutes of reunion behavior in an unnatural and unfamiliar laboratory setting to reveal an emotional history between parent and child of a whole year? In my opinion, the answer is no. These findings can only obtain generalizability when replicated in independent studies in which bias is controlled and a priori predictions are tested and verified. Therefore, Ainsworth et al.'s (1978) study should be viewed as a study that generated hypotheses, not that tested them.