  We discuss here various methodologies and an optimal strategy of the
temperature and emission measure diagnostics based on Hinode X-Ray Telescope
data. As an example of our results we present determination of the temperature
distribution of the X-rays emitting plasma using filters ratio method and three
various methods of the calculation of the differential emission measure (DEM).
We have found that all these methods give results similar to the two filters
ratio method. Additionally, all methods of the DEM calculation gave similar
solutions. We can state that the majority of the pairs of the Hinode filters
allows one to derive the temperature and emission measure in the isothermal
plasma approximation using standard diagnostic based on two filters ratio
method. In cases of strong flares one can also expect well conformity of the
results obtained using a Withbroe - Sylwester, genetic algorithm and
least-square methods of the DEM evaluation.
