We summarize practical considerations for performing highly accurate terahertz spectroscopy measurements of amorphous systems. We also outline possible perspectives for a further development of terahertz spectroscopy and its applications. This includes a deeper understanding of terahertz dynamics of amorphous systems and the development of a theory for a comparison of terahertz spectra to the results commonly obtained from well-established scattering experiments.The authors gratefully acknowledge S. Capaccioli, K. Ngai and W. Schirmacher for stimulating discussions, as well as G. Cinque for his assistance with the measurements at the Diamond Lights Source. This work was carried out with the support of the Diamond Light Source. We would also like to acknowledge the U.K. Engineering and Physical Sciences Research Council (EP/J007803/1) as well as MedImmune for funding. We thank to Bristol-Myers Squibb for the generous donation of Kollidon VA 64
