August 4, 2003
      
                  
        
  Author(s)
  Elizabeth B. Lennon
 
       
            
    
    
        This ITL Bulletin summarizes the recently published NIST Special Publication (SP) 800-55, Security Metrics Guide for Information Technology Systems, by Marianne Swanson, Nadya Bartol, John Sabato, Joan Hash, and Laurie Graffo. NIST SP 800-55 provides