Its main purpose is identifying potential vulnerabilities of persons in the impending employment phase (~ 80% of cases) or in the period immediately following employment (~ 20% of cases).
In any business, the secret of effective leadership is to understand what person should be assigned to a particular job depending on their skills.
Preventively it is used on large scale in various fields (economic, military, private security services, etc.).
In terms of procedure it represents a well-elaborated/structured approach which aims at clarifying the potential involvement or noninvolvement of a person in a controversial event.