[michèle 2]

Hi agraffka,
Eclecticism ( n )
Eclectic ( Adj) Not following one style or set of ideas but choosing from or using a wide variety.
"She has very eclectic tastes in literature"
first of all go to Wikipedia for details. it explains the origins of the word. Then it depends on the kind of essay you have to write.
When i was a student we used to write introduction, 2 paragraphs with examples and a conclusion.
Good luck