Asteroseismology relies on accurate mode-identification. High-resolution spectroscopy offers to detect such crucial information as the pulsational degree L, the azimuthal number M, and pulsation amplitudes, directly from time-series of observations. The advantage of high-resolution spectroscopy over standard photometric techniques is that not only pulsational temperature variations can be detected, but also the time-variable pulsational velocity field, yielding valuable extra information.
I will be reviewing the mode-identification techniques that have been developed over the last decades, with an emphasis on the application to hot main-sequence stars. The accuracy of these methods will be addressed as well.

 
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