  Preface to the special issue "Characterisation of Physical Processes from
Anomalous Diffusion Data" associated with the Anomalous Diffusion Challenge (
https://andi-challenge.org ) and published in Journal of Physics A:
Mathematical and Theoretical. The list of articles included in the special
issue can be accessed at
https://iopscience.iop.org/journal/1751-8121/page/Characterisation-of-Physical-Processes-from-Anomalous-Diffusion-Data .
