<div class="htmlview paragraph">Operational Modal Analysis -the technique where modal parameters are estimated without known input forces- has been an accepted tool in advanced mechanical engineering.</div> <div class="htmlview paragraph">The technique has its advantages were the modal parameters have to be estimated during the operational conditions as in flight ad on road testing.</div> <div class="htmlview paragraph">The paper will discuss the recent state of the art in vibration data acquisition as well as in modal parameter estimation enabling easy use of Operational Modal Analysis. A new data optimisation method, which will enhance the speed of calculation, will be shown</div> <div class="htmlview paragraph">Examples from both laboratory set-up and practical examples from automotive applications will be shown.</div>