Summary: The objective is to give a general panorama of modal analysis identification techniques, as a detailed explanation is not possible due to the vast amount of available information concerning the many existing methods. Beginning with an introduction, followed by the various types of classification and a short historical note, the reader is led into the subject, although he or she needs much more information to delve deeper into specific details and developments of individuals methods. This information is provided in the fundamental works and textbooks we have cited.