The interest in XANES spectroscopy is growing systematically in material sciences as it is a very unique\ud
local probe, chemically selective, giving access to fine details of the local atomic structure and electronic\ud
state of the photo-absorber, which are hardly reached by other techniques. The recent progresses in theory\ud
and computation have extended the application of XANES spectroscopy in many different fields. This\ud
chapter aims to be a guide across the different approaches to XANES data analysis, from the\ud
phenomenological semi-quantitative methods, to accurate ab-initio modelling and data fitting