Given that such a wide range of methods, spanning large frequency regimes, produce comparable results when studying amorphous dynamics, an in-depth experimental and theoretical examination of a well-studied molecular glass-former, sorbitol, was performed to investigate any possible relationship between the various techniques. Figure shows experimental results from THz-TDS, mid-infrared Fourier-transform infrared spectroscopy (FTIR) and DMA measurements, complemented by BLS measurements by Ruta et al. , as well as theoretical ab initio moleculardynamics (AIMD) simulations results, all plotted as a function of temperature. The results clearly show that each of these experimental methods are capable of sensing both of the glass transition temperatures, T gα and T gβ , as well as the change in the temperature dependence in the regions above and below both of these (traditionally linked to the α-relaxation above T gα , the β -relaxation below T gα and above T gβ , and a third region below T gβ ). While each of the techniques are capable of sensing the glass transitions (see ESI for individual plots) there are slight discrepancies between the actual value of the temperatures between the techniques (≈ ±5 K), which is still subject to interpretation. Additionally, the absolute values of T g are known to be slightly dependent on the heating/cooling rate as well as the thermal history of the sample, however in the case of this study these relatively minor temperature shifts were minimised by using very slow cooling rates as well as the lack of significance on the overall aim of this work, which is related to the universality of the observed phenomena Furthermore, to highlight that the results presented in this work are not simply confined to small-molecule or hydrogen bonded systems like sorbitol, and as originally suggested based on previous reports, Figure also contains results from BLS , neutronscattering mean-squared-displacement (MSD) , and deuteron nuclear magnetic resonance ( H-NMR) spin-lattice relaxation measurements on ortho-terphenyl (OTP), and neutron-scattering MSD , positron spectroscopy (PS) , quasi-elastic light scattering (QELS) , and dielectric spectroscopy for polymethyl methacrylate (PMMA), which exhibit the same temperaturedependent behaviour as described for sorbitol, although with different values for T gα and T gβ . It is important to comment that as noted previously , these data represent the detection of T gα and T gβ across time-scales spanning over 15 orders of magnitude, indicating that a fundamental link between the processes must exist.