How is data security inherited in User Level and Role Security?

How is data security inherited in User Level and Role Security?

User Level Security: If the user does not have any KPIs assigned then it will inherit from the Role level. If Role also does not have any KPIs then user will inherit from Department level. Role Level Security: If there no KPIs assigned at Role level then Role will hire the KPIs from Department Level. If the Department is not assigned any KPIs, then the KPIs assigned to Role level will appear for User level.