  The Davis-Chandrasekhar-Fermi (DCF) method using the Angular Dispersion
Function (ADF), the Histogram of Relative Orientations (HROs) and the
Polarization-Intensity Gradient Relation (P-IGR) are the most common tools used
to analyse maps of linearly polarized emission by thermal dust grains at
submilliter wavelengths in molecular clouds and star-forming regions. A short
review of these methods is given. The combination of these methods will provide
valuable tools to shed light on the impact of the magnetic fields on the
formation and evolution of subparsec scale hub-filaments that will be mapped
with the NIKA2 camera and future experiments.
