classfication

Classification
distinction ,identification and organization of two or more items,information and facts according to thier similarities whichch are determine through comparison.
Platos theories of universal
1.universalia in -universal in the things
2.universalia ante rem -universal before the things
3.universalia post rem-universal after the things
Four different types of similarity
1.genetic similarity
2.structural similarity
3.functional similarity
4.aparrent similarity