Military forces rank and compartmentalize information in levels ranging from all personnel access to top secret clearance requirements. This strategy is easily applicable to businesses as an effective way to ensure that each employee only has access to information they require to perform their duties without giving them access to critical business secrets. This is especially critical for businesses in the technology sector where corporate espionage is rife and there have been several cases of rival companies sending spies to gather information on competitors. Company data can be classified into three categories of public, private and sensitive with each category restricted to particular employees.