What is "thematology"?i am stuent of m.a. (eng), and couldnt find appropriate answer to my querry....how it helps in evaluating works of art?

Thematology is simply the study or science of ("ology") a
theme. The purpose of thematology is to study a theme typically in regards to
geographical distributed cultures.  While this may seem even more confusing than the
term thematology, consider the phrase once
dissected.

Geographical means relating to geography.
Geography is (according to Google):

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The study of the physical features of the earth
and its atmosphere, and of human activity as it affects and is affected by
these.

Distributed means to
give out shares of something or to divide between
many.

Lastly, cultures means (according to Merriam
Webster):

the
customary beliefs, social forms, and material traits of a racial, religious, or social
group.

Therefore,
geographically distributed cultures refers to the study of the whole of the earth in
regards to how cultures are affected by their distribution on earth. (How a region
survives given it is mountainous or, how a people survive given their
resources.)

This being defined, themaology refers to themes
which are present regarding collections of works which deal with geographically
distributed cultures.