Do these processes seem right for the different security clearances?  Found this on two different sites. 

For CONFIDENTIAL and SECRET clearances: 

-  A National Agency Check (NAC)-A computerized search of investigative files and other records held by federal agencies such as the Federal Bureau of Investigations (FBI) and Office of Personnel Management (OPM). 
-  A Local Agency Check (LAC)-A review of appropriate criminal history records held by local law enforcement agencies, such as police departments or sheriffs, with jurisdiction over the areas where you have resided, gone to school, or worked. 
-  Financial checks - A review of your Credit Record. 


For TOP SECRET clearances: 

A Single Scope Background Investigation (SSBI) is performed which includes all of the above, plus: 

-  Field interviews of references to include coworkers, employers, personal friends, educators, neighbors, and other appropriate individuals. 
-  Checks of records held by employers, courts, and rental offices. 
-  A subject interview - An interview with you by an investigator. 


THANKS!!