This International Standard gives guidance for data interpretation and diagnostics of machines. It is intended - to allow the users and manufacturers of condition monitoring and diagnostics systems to share common concepts in the fields of machine diagnostics, - to enable users to prepare the necessary technical characteristics that will be used for the further diagnosis of the condition of the machine, and - to give an appropriate approach to achieve a diagnosis of machine faults. Since it gives general guidelines, a list of the machine types addressed is not included. However, the machine sets covered by this International Standard will normally include industrial machines such as turbines, compressors, pumps, generators, electrical motors, blowers and fans.