“The Peter Principle is a special case of a ubiquitous observation: anything that works will be used in progressively more challenging applications until it fails. There is much temptation to use what has worked before, even when it may exceed its effective scope. Dr. Peter observed this about humans.
“…members of a hierarchical organization eventually are promoted to their highest level of competence, after which further promotion raises them to incompetence…even in instances where an employee can handle their current job but fail to do any better, they can still cause harm within the company, by way of preventing those beneath them with higher potential of moving up, as well as lowering morale once such employees become aware of this fact.”