"Abstract:-This article presents a comparison study on the performance of methods for fault detection in ball bearings. Different kinds of actual faults have been acquired in real time from a test platform and a signal of a fault in an early stage has been created. The effectiveness of prediction of several methods is tested when faults are in different stages of development. Furthermore, the implementation of these techniques for actual systems and real-time application is discussed. Key-Words:-fault detection, bearings, incipient fault"