•There are three levels of security clearance as defined by the GSP: Confidential (Level I), Secret (Level II) and Top Secret (Level III). The level of security clearance required is determined by the need for access to classified information or assets in the performance of duties associated with an individual's employment. Level I and II security clearances involve checking CSIS databanks. Level III security clearances require a full field investigation, which involves checking CSIS records; interviewing friends, neighbours and employers; consulting with local police; and, possibly interviewing the applicant.
these levels are defined for canadian employeers. i .e.e for people seeking job in goverment institutions. immigration screening has a different criteria most probably