Typically, a test is given at the beginning of the test phase of an examination in which the examinee
agrees to lie to a number or letter. The test is not scored nor used for veracity testing. The acquaintance test serves several purposes: to familiarize the examinee with the test procedures; to properly set the gains and centerings; to help detect countermeasures and to assess the range of responsiveness of the examinee. Other forms and terms for this type of test include the Numbers Test, Demonstration Test, Stimulation (Stim) Test, Practice Test, Blind Numbers Test, Calibration Verification of Sensitivity Test (CVOS), and True Blue Control Test.