When a person starts an employment relationship, he or she is granted access to all data systems related to his or her role at once.
Our organization has defined procedures for coordinating, at the time of termination of employment, e.g..:
Shared accounts should only be allowed if they are necessary for business or operational reasons and should be separately approved and documented.
If shared accounts are used for admin purposes, passwords must be changed as soon as possible after any user with admin rights leaves their job.