The most subjective method of voice identification is the aural, long-term memory method, where the listener is familiar with the perceptual characteristics of a given voice. The aural method by short-term memory is another subjective method. In this method, the examiner is a trained person not necessarily familiar with the unknown voice; however, the examiner is able to compare known and unknown voices using two tape recorders. Another subjective method is the examination of spectrograms of the same text from unknown and known voices to detect similarities and dissimilarities between patterns of similar words. The objective methods can be classified into semiautomatic, automatic, and voice authentication. Each of these methods requires the use of a computer. Semiautomatic methods require a larger interaction between the examiner and machine. Automatic methods require the input of proper samples and human interpretation of the computer output. Methods of voice authentication consist of programming a small computer with a reduced library of known voices. All of these methods can be used concurrently. The reliability of the use of these methods necessitates the option of using five decisions: (1) unknown and known voices are the same within a given probability; (2) unknown and known voices are the same within a high level of confidence; (3) unknown and known voices are different within a given probability; (4) unknown and known voices are different within a high level of confidence; and (5) no opinion one way or the other. Nine references are provided.