That's the model I've come to use, based on observation, reason, and tons of research:
* spirit
* astral body
* etheric body
* physical body
The spirit is eternal.
The astral body is the last to be given up after death, and the first to be formed around the spirit upon the decision to reincarnate. It's the personality-costume worn by spirit. Without it, spirit is impersonal and cosmic in its qualities.
The etheric body forms in and around the physical embryo during gestation. It acts as the interconnection between spirit/astral and the physical body. It also sustains life within the physical body. Without it, the physical body would be a corpse.
The first death is what we know as death. The physical body ceases to function. The etheric + astral + spirit leave the physical via an OBE/NDE. The mind is generally still intact and localized within space and time due to the etheric body synchronizing the spiritual with the physical realm.
But once the etheric body disintegrates or is left behind, which on average occurs within 3-7 days (unless psychic vampirism or esoteric meditation practices sustain its form), the astral + spirit then move on into whatever part of the dreamlike astral plane it resonates with.
The astral is what many call the afterlife but it's only the staging area. Residual self-image continues to exist there, so people hang out in the astral doing whatever's in their nature to do.
Eventually even the astral body is left behind, which completes the second death. The costume is stowed back in the cosmic closet, so to speak.
The impersonal godspark or spirit moves up into the true afterlife where it communes with cosmic spiritual intelligences and has a timeless view of its existence.
Then depending on its level of development, it either chooses or is forced to come back via reincarnation. The astral forms around it while the etheric forms around the embryo, and the two interlock more and more frequently as birth approaches. Then it's another trip around the rollercoaster of life.
Variations of the above is what you'll find in all the ancient mystery school traditions, Theosophy, Anthroposophy, afterlife and reincarnation studies, and what good mediums pick up on.
It's a generic template and there are many aberrant exceptions to it, like souls that maintain their form after death and acquire the power to consciously manifest a new body without reincarnating.