Racial-- ethnic-- national groups-- Social stratification 8 Age groups -Social aspects 1 Backward class 1 Caste 1 Community Psychiatry 1 Community psychology 1 Ethnic groups- Social groups 1 Ethnography-Caste system 1 Focus groups; Social sciences-research-methodology; Social groups 1 Minority Groups 1 Politicall organization- Dalits-India 1 Psychology, Social 1 Racial groups- Social groups 1 Racial--ethnic--national groups--Social stratification--malayalam 1 Scheduled caste-Discrimination 1 Small groups 1 Social Environment 1 Social groups 1 Social groups- Social class 1 Social interaction in groups-- Social interaction 1 Social interaction in groups--Social interaction 1 Social service 1 Socioeconomic Factors 1 Sociology 1 Theory of pollution 1 Untouchability- Social problems 1 Untouchables- Harijan 1 psychology 1