The story of the success of the destitute Satyakama and the chandaal Valmiki brings into question its rigidity as originally practiced.  Divided into 
The story of the success of the destitute Satyakama and the chandaal Valmiki brings into question its rigidity as originally practiced.  Divided into jati, they are also called varna, which also means "color", perhaps a reference to early Indo-European settlers. Codified in the Book of Manu, some scholars point out that guna, which means "qualification", was never intended to extend to heredity, which has made life hard for the harijan. FTP, Shudras are distinguished from the twice-born Vaishyas, Kshatriyas, and Brahmins by what Hindu system of social stratification?
The story of the success of the destitute Satyakama and the chandaal Valmiki brings into question its rigidity as originally practiced.  
caste system (accept varna before mentioned)