The stages model, which came about in the 1960s, is a theory based on observation of people who are dying, not people who experienced the death of a loved one. This model found limited empirical support in a study by Maciejewski et al. That is that the sequence was correct although Acceptance was highest at all points throughout the persons experience. The research of George Bonanno, however, is acknowledged as debunking the five stages of grief because his large body of peer-reviewed studies show that the vast majority of people who have experienced a loss are resilient and that there are multiple trajectories following loss.