... qUANGVi du 4.(Moi quan h~ I-n)Mohlnhthlfc thE! - quan h~GIAOVIEN(1,1)thuoc -& apos ;-, ®tenkhoasodienthoaiHinh 3Vi du 5.(Moi quan h~n-n]Mohlnhthlfc thE! - quan h~~giangsotietHinh ... mdi quan h~ is-a [quan h~ ke thira], mdi quanh~ phan x' !- [mdi quan h~ giiia cac thtrc thg trong cung m<$tt~p thtrc thg), mdi quan h~ nhi nguyen(mi)i quan h~ 1-1 , 1-n, n-n)' mdi ... QUANGAbstract.Entities represent classes of real-world objects. As a result, problem of converting Entity-Rela-tionship Model into Object-Oriented Model is taken shape naturally. In order...