Grief (novel)
During the course of the novel, the ideas of the stages of grief are introduced. The stages are denial, anger, depression, and acceptance. The narrator, as well as other characters in the story, slowly passes through these stages in trying to deal with death.
Susan Anderson (psychotherapist)
Anderson uses / adapts the five phases of grief in the Kübler-Ross model to abandonment. Her framework describing abandonment recovery breaks it down into five phases: Shattering, Withdrawal, Internalizing, Rage and Lifting (SWIRL). The acronym is designed to depict the cyclonic nature of the grief.