schema
noun /ˈskiːmə/
  /ˈskiːmə/
(plural schemas, schemata 
 (specialist) /ˈskiːmətə/,  /skiːˈmɑːtə/
  /ˈskiːmətə/,  /skiːˈmɑːtə/
)- an outline of a plan or theory- an attempt to reduce complex economic theory to a simple schema
 Word Originlate 18th cent. (as a term in philosophy): from Greek skhēma ‘form, figure’.