The 5 Stages of Grief, developed by Swiss-American psychiatrist Elisabeth Kübler-Ross in 1969, is a popular model that people use to explain the process of grief. But I come today with a warning about taking it too literally.
If the 5 Stages of Grief helps you understand how you process grief, that's great! But don't feel like you're grieving the wrong way if you don't experience grief in 5 stages like the model. Grief is an individualized process that is unique to everyone.