  During the workshop "Compton Scattering off Protons and Light Nuclei: pinning
down the nucleon polarisabilities" (ECT*, Trento, Italy, 29 July -- 2 August
2013, http://www.ectstar.eu/node/98), recent developments had been reviewed in
experimental and theoretical studies of real and virtual Compton scattering,
static and generalized dipole scalar and spin polarisabilities of nucleons, as
well as related phenomena in physics of muonic atoms. A vivid topic at the
workshop was pathways towards the most precise extraction of the static
polarisabilities from low-energy Compton cattering---including pertinent
theoretical uncertainties. Being asked by our experimental colleagues, we
prepared during the workshop a short letter with conclusions of the discussion,
emphasising future prospects.
