Characterization describes those features of composition
and structure (including defects) of a material that are
significant for a particular preparation, study of properties,
or use, and suffice for the reproduction of the material.
(National Research Council of USA; 1967)
I believe that who can control the composition and structure
of materials will control the universe.
Characterization is the most important skill for it.
I am focusing on the characterization as my research topic.