I Basics of Biometrics.- 1 Introduction.- 2 Authentication and Biometrics.- 3 The Common Biometrics.- 4 Additional Biometrics.- II Performance and Selection.- 5 Basic System Errors.- 6 Identification System Errors.- 7 Performance Testing.- 8 Selecting a Biometric.- III System Issues.- 9 Creating and Maintaining Databases.- 10 Large-Scale Applications.- 11 Integrating Information.- 12 Thwarting Attacks.- 13 APIs, Standards, and Databases.- IV Mathematical Analyses.- 14 A Biometric's Individuality.- 15 System Errors Revisited.- 16 Advanced Topics.- 17 What's next?.- References.